Photosensitive film composite image medium, preparation method and application

Abstract

The invention belongs to the technical field of image materials, and particularly relates to a photosensitive film composite image medium, a preparation method and application. Comprising the following steps: S1, exposing a photosensitive film to obtain an overexposure film; s2, carrying out reverse flushing on the overexposure film to obtain a visual image; and S3, attaching the visible image to the reflector to form the photosensitive film composite image medium. The invention provides a brand new photosensitive film processing method. And carrying out overexposure treatment and reverse flushing, and tightly attaching the obtained low-density film to a reflector (such as photographic paper) like a film to form a complete complex. The method breaks through the tradition that the photosensitive film must be watched by backlight. By compounding the processed film and the reflective base material, the obtained complex realizes a reflective image watching function, so that a final image work can be directly appreciated under common indoor light and gallery light like an oil painting and a common photo, and the application scene and the display flexibility of the image work are greatly expanded.

Description

Technical Field

[0001] This invention belongs to the field of imaging materials technology, and specifically relates to a photosensitive film composite imaging medium, its preparation method, and its application. Background Technology

[0002] Photosensitive film, as a classic medium for recording images, has a long and widespread application in fields such as photography, medical imaging, industrial inspection, and printing plate making. Its imaging essence is based on the photochemical reaction of silver halides. Through exposure and subsequent chemical washing, the optical information of the subject is converted into stable images with different densities of metallic silver or dye.

[0003] Traditional applications of photographic film rely heavily on its transmissive imaging properties. Whether it's a negative (such as photographic film) serving as an intermediate medium or a positive (such as slides) as the final image carrier, viewing and using it requires specialized transmissive light sources, such as viewing light boxes, slide projectors, or optical enlargers. In this mode, light passes through the back of the film, and the human eye or sensor receives the light intensity after it has passed through different density areas of the film, thus perceiving the brightness and detail of the image. This limits the final application scenarios of photographic film to environments that require specific transmissive lighting equipment.

[0004] Throughout the long history of photographic film development, technological improvements have largely focused on improving sensitivity, graininess, color reproduction, and optimizing conventional developing processes. However, there is a significant gap in the industry's exploration of the potential of photographic film as a material medium, particularly in breaking through its inherent transmissive viewing mode. Few technical solutions have systematically studied how to fundamentally change its final usage and presentation by altering its initial photosensitivity control and subsequent developing processes.

[0005] Therefore, the existing technology has the following main drawbacks: Limited application scenarios: The viewing of photosensitive film heavily relies on transmitted light sources. It cannot be viewed directly and conveniently in environments with non-transmitted or reflected light sources, such as ordinary indoor light or natural light, which limits its flexibility and popularity in display.

[0006] Limited range of expressive forms: The image quality of photographic film is limited to the transmission viewing mode, lacking the unique visual texture and artistic expression that can present a reflection of traditional photographic paper, painting and other reflective image media.

[0007] Technological path solidification: The processing and use of photographic film has long been limited to the existing positive / negative film paradigm, lacking an integrated technical solution that can transform it into a new type of reflective imaging medium, including specific exposure, processing and composite methods. Summary of the Invention

[0008] The purpose of this invention is to overcome the limitation of the use of photosensitive film in the prior art to the existing positive / negative film paradigm as a transmission medium, which makes its application scope narrow, and to provide a photosensitive film composite imaging medium, preparation method and application.

[0009] In a first aspect, the present invention provides a method for preparing a photosensitive film composite imaging medium, comprising the following steps: S1. Exposure processing of the photosensitive film to obtain overexposed film; S2. The overexposed film is reverse-washed to obtain a visible image; S3. The visible image is bonded to the reflector to form a photosensitive film composite image medium.

[0010] This invention provides a novel photosensitive film processing workflow. Instead of following the traditional path of preparing film into slides for projection or negatives for printing, it transforms the film through three key steps: first, exposure according to specific requirements; second, developing to obtain a low-density image; and finally, bonding the resulting low-density film tightly to a reflective substrate (such as photographic paper) like a lamination, forming a complete composite. This method fundamentally breaks through the traditional requirement that photosensitive film must be viewed against the light. By laminating the processed film with a reflective substrate, the resulting composite achieves reflective image viewing functionality, allowing the final image to be viewed directly under ordinary indoor or gallery lighting, just like an oil painting or a regular photograph, greatly expanding its application scenarios and display flexibility.

[0011] In the technical solution of this invention, the composite image medium is an integral image product that combines the unique silver halide or color texture of film with the reflective viewing method of photographic paper, creating a brand-new visual carrier that is neither a traditional photograph nor a transparent slide.

[0012] Preferably, the overexposure processing step is as follows: first, determine the reference exposure parameters based on the ISO value information of the photosensitive film, the reference exposure parameters including the aperture value and the shutter value, and then adjust the shooting parameters to an overexposure state based on the reference exposure parameters.

[0013] Active overexposure ensures that a sufficient number of photosensitive centers are generated in the film emulsion layer, laying the physical foundation for obtaining an image with fewer silver grains and a thinner density through subsequent developing processes. This is a prerequisite for achieving a bright, visible image under reflected light.

[0014] Specifically, there are several ways to handle overexposure: increase the exposure time based on the metering results; Alternatively, based on the metering results, increase the aperture.

[0015] Preferably, the overexposure level is: 1 / 2EV-2EV overexposure.

[0016] Preferably, the reverse washing step is determined according to the film type: When the film is a color negative, the reversal processing steps include: first development, reversal, color development, pre-bleaching, bleaching and fixing, and stabilization; when the film is a black and white negative, the reversal processing steps include: first development, bleaching, cleaning, second exposure (reversal), second development, and fixing.

[0017] The reverse processing technology is one of the core components of this invention. It directly produces a positive image, avoiding the hassle of reprinting when used as a negative. More importantly, this process provides a precise chemical control method for actively reducing the density of the final image by adjusting steps such as the initial development.

[0018] The goal of color reversal film is to obtain a transparent positive film (reversal film) with vibrant colors that can be viewed directly. Its core principle is: through two development processes, the areas that form a latent image during the first exposure are eventually transformed into transparent areas, while the areas that were not exposed during the first exposure eventually form a dye image.

[0019] Steps: First display → Reverse → Color display → Pre-bleaching → Bleaching → Stabilization → Drying.

[0020] The goal of black-and-white reversal is to obtain a transparent positive film (reversal film) in black and white. Its core principle is more intuitive: first, the negative image is developed, then it is completely bleached, and then the remaining silver halide is exposed and developed as a whole to obtain the positive image.

[0021] Step-by-step process: First exposure → Wash → Bleaching → Cleaning → Second exposure (reverse) → Second exposure → Fixing → Wash → Drying.

[0022] Preferably, the reverse washing includes a first development, which, by extending the first development time or increasing the developing activity, produces a negative image density greater than the conventional standard.

[0023] Specifically, the first development step of the reverse washing is set to: make the image density of the final photosensitive film a first image density, and make the image density generated when the photosensitive film is used as a standard transmission for first development a second image density, and the first image density tends to be overdeveloped compared to the second image density.

[0024] Overdevelopment is controlled by extending the development time, and the extension time varies depending on the formulation of the developer. For example, if a one-stop increase in exposure is needed (in photography, a one-stop increase means a doubling of the exposure, or a doubling of the density corresponding to the exposure on film or photographic paper), commonly used MQ (Metol-hydroquinone system) developer formulations typically extend the development time by about 1.4 times, while some PQ (Phenylidene-hydroquinone system) developers may only need to extend it by 1.2 times.

[0025] The development time varies considerably depending on the film and exposure parameters. Those skilled in the art can conduct quantitative experiments based on the qualitative description of the technical solution to obtain the effect that meets the usage requirements.

[0026] In the reversal process, the silver halide generated during the initial display is the final negative image. In the technical solution of this invention, by extending the initial display time or increasing the development activity, the density of the negative image generated during the initial display is greater than the conventional standard. Thus, in subsequent reversal and color / secondary display steps, less silver halide can be converted into a positive image, resulting in a thinner and more transparent final positive image.

[0027] Preferably, the initial display solution used in the initial display step contains potassium thiocyanate.

[0028] Preferably, the concentration of potassium thiocyanate is not less than 2 g / L.

[0029] Preferably, the developer is formulated with D67: The D67 display solution comprises the following raw materials in parts by weight: Mix 2g of Mitell, 8g of hydroquinone, 90g of anhydrous sodium sulfite, 48g of anhydrous sodium carbonate, 5g of potassium bromide, and 2g of potassium thiocyanate with water to a final volume of 1000mL to obtain D-67 initial development solution.

[0030] Preferably, the apparent density of the photosensitive film satisfies the following formula:

[0031] Where D represents the perceived density, d0 represents the film base density, d1 represents the transmission density of the film emulsion layer, d2 represents the reflection density of the reflector, and C represents the illumination constant related to the viewing ambient light angle.

[0032] The perceived density is matched to the reflective density of the reflective medium (such as black and white photographic paper).

[0033] Preferably, the initial display solution used in the initial display step contains potassium thiocyanate.

[0034] Preferably, the concentration of potassium thiocyanate is not less than 2 g / L.

[0035] Preferably, the reflector is acid-free paper with high reflectivity. The acid-free paper includes any one of the following: barium oxide coated acid-free photo paper, barium sulfide coated acid-free photo paper, or pure cotton acid-free art paper.

[0036] Using the aforementioned acid-free paper-based photographic paper as a reflector maximizes the reflection of incident light, resulting in brighter, more saturated colors, and a wider tonal range for the film images overlaid on it. Simultaneously, the acid-free nature ensures the entire composite medium possesses excellent durability and collectible value, resisting yellowing or deterioration over time.

[0037] Secondly, the present invention provides a photosensitive film composite image medium obtained according to the above method.

[0038] Thirdly, the present invention provides a method for using a photosensitive film composite image medium, including viewing the composite image medium in a normal non-transmissive light source environment.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a novel photosensitive film processing workflow. Instead of following the traditional path of preparing film into slides for projection or negatives for printing, it modifies the photosensitive film: first, it is exposed according to specific requirements; then, it undergoes developing to obtain a low-density image; finally, the resulting low-density film is tightly bonded to a reflective substrate (such as photographic paper) like a film, forming a complete composite. This invention fundamentally breaks through the traditional requirement that photosensitive film must be viewed against the light. By bonding the processed film to a reflective substrate, the resulting composite achieves reflective image viewing functionality, allowing the final image to be viewed directly under ordinary indoor or gallery lighting, just like an oil painting or a regular photograph, greatly expanding its application scenarios and display flexibility. Attached Figure Description

[0040] Figure 1 This is a ray path diagram of reflected light illuminating a composite influence medium. Figure 2 This is a view of the composite image medium of Embodiment 1 of the present invention viewed under transmitted light conditions; Figure 3 This is a view of the composite image medium of Embodiment 1 of the present invention viewed under reflected light conditions; Figure 4 This is a view of the composite image medium of Comparative Example 1 of the present invention viewed under transmitted light conditions. Figure 5 This is a view of the composite image medium of Comparative Example 1 of the present invention viewed under reflected light conditions; Figure 6 This is a view of the composite image medium of Embodiment 2 of the present invention viewed under transmitted light conditions; Figure 7 This is a view of the composite image medium of Embodiment 2 of the present invention viewed under reflected light conditions; Figure 8 This is a view of the composite image medium of Comparative Example 2 of the present invention viewed under transmitted light conditions; Figure 9 This is a view of the composite image medium of Comparative Example 2 of the present invention viewed under reflected light conditions.

[0041] Marked in the image: 1-Reflector, 2-Photosensitive film, 21-Base layer, 22-Emulsion layer. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0043] This embodiment discloses a photosensitive film composite imaging medium, designated #1; the composite imaging medium is prepared in the following manner: S1. Exposure processing of photosensitive film to obtain overexposed film; the overexposed processing steps are as follows: first, determine the reference exposure parameters based on the ISO value information of the photosensitive film, the reference exposure parameters include aperture value and shutter speed value, and then adjust the shooting parameters to an overexposed state based on the reference exposure parameters.

[0044] Specifically, in this embodiment, a certain type of ISO 100 black and white film is photographed using direct photography. A reflective light meter is used to meter the subject at ISO 100, obtaining exposure parameters of 1 / 60s shutter speed and F8 aperture. At this point, the camera shooting parameters are set to 1 / 30s shutter speed and F8 aperture, which is an overexposure of 1EV based on the metering parameters. The film is then photographed using these exposure parameters, resulting in an overexposed film.

[0045] S2. The overexposed film is reverse-washed to obtain a visible image; Specifically, the reversal washing step is determined according to the film type: When the film is a color negative, the reversal processing steps include: first development, reversal, color development, pre-bleaching, bleaching and fixing, and stabilization; when the film is a black and white negative, the reversal processing steps include: first development, bleaching, cleaning, second exposure (reversal), second development, and fixing.

[0046] To achieve overdevelopment of the film based on the original development.

[0047] The preferred developing solution is a self-developed developing formula: 4g of Metol, 80g of anhydrous sodium sulfite, 12g of hydroquinone, 60g of anhydrous sodium carbonate, 15g of anhydrous potassium carbonate, 5g of potassium bromide, and 2.5g of potassium thiocyanate, with water added to 1000ml. 300ml of this solution is used as the rinsing working solution in this embodiment.

[0048] In this embodiment, the concentration of potassium thiocyanate is not less than 2 g / L. Specifically, the concentration of potassium thiocyanate is 2.5 g / L.

[0049] Through testing, the initial development time of this type of film at ISO 100 under normal transmission applications is 5 minutes. Here, the development time will not exceed 6.5 minutes. In this embodiment, it is set to 6 minutes. S3. The visible image is bonded to the reflector to form a photosensitive film composite image medium.

[0050] After washing and drying, the film is used by placing it on barium oxide acid-free photo paper, ensuring close adhesion between the film and the paper. At this point, the film and photo paper form a composite image medium of photosensitive film and reflector. This composite image medium is then mounted acid-free and placed in a normal indoor environment for viewing under ordinary non-transmissive light sources. Specifically, the acid-free photo paper is a barium oxide coated acid-free photo paper of a certain brand.

[0051] In this embodiment, the apparent density of the photosensitive film satisfies the following formula:

[0052] Where d0 represents the film base density; d1 represents the transmission density of the film emulsion layer; d2 represents the reflection density of the reflector; and C represents the illumination constant related to the viewing ambient light angle.

[0053] The mid-gray point at the perceived density of composite media matches the mid-gray point in reflective media such as photographic paper.

[0054] The formula for calculating the apparent density of the above-mentioned photosensitive film composite imaging medium is derived as follows: Ideally, the photographic film 2 is simplified to a base layer 21 and an emulsion layer 22. The emulsion layer is used to display the image. All other layers of the photographic film, except the emulsion layer, are collectively referred to as the base layer. Figure 1 As shown in the diagram. 3 represents the reflected light measuring device, 4 represents the incident light, 5 represents the reflected light, and d represents the sinusoidal difference.

[0055] Ideally, the reflector 1 and the emulsion layer 22 of the photosensitive film 2 are tightly bonded together without any gaps between them; Ideally, neither the base layer 21 nor the emulsion layer 22 of the photosensitive film 2 will reflect light, and the relationship between the transmittance of the transmitted light and the angle of incidence follows the cosine law. Ideally, the photosensitive film 2 is thin enough that the sine difference d between the incident and exit points has no effect on the macroscopic perception. Since this process involves the combined calculation of reflectance density and transmission density, and reflectance density has specific experimental conditions, the calculation process provided is based on the experimental conditions of reflectance density, namely: a beam of light of known intensity is irradiated onto the sample at a 45° angle, and the intensity of light reflected from the sample surface is measured in the vertical direction (0°). At the same time, the intensity of light reflected from a standard white board with known high reflectance is measured under the same conditions. The reflectance and reflectance density are calculated by calculating the ratio of the two and the logarithm of their reciprocals. Let the known intensity of illuminance be... The unit is lux; let the transmittance of the film substrate be... Let the substrate density (fog) be denoted. Assume the light transmittance of the emulsion layer is... Let the emulsion layer transmittance density be... Let the reflectivity of the reflector be... Reflection density of reflector ; Under the experimental conditions described above, the intensity of light reflected from the composite image medium is measured. Let the perceived density of the composite image medium be... ; We can obtain:

[0056]

[0057] so:

[0058] Taking the logarithm of both sides, we get:

[0059] further:

[0060] Due to constant The above formula is related to the incident angle under the experimental conditions. In actual application environments, the light source conditions differ from the experimental conditions. Therefore, in practical application scenarios, the above formula is denoted as:

[0061] Where D represents perceived density, d0 represents film base density (fog), d1 represents emulsion layer transmission density, and d2 represents reflector reflection density. is the light constant. When the incident angle is small, the value is small; when the incident angle is large, the value is large. 0 < C < 0.3. When the ambient light is uniform and sufficient, the influence of C can be ignored.

[0062] During this processing, to obtain the perceived density at medium gray in the composite image medium, according to the above formula, the following are measured respectively: , , , since it is in a bright and evenly lit room, so the value is low, take 0.1, substitute it into the above formula to get: .

[0063] Among them, the above medium gray specifically refers to: the middle part in the gray scale from black to white of the composite image medium, also called 18% gray, with an average reflectance of 18%. Medium gray is both a visual anchor point for judging whether the tone is normal and a reference for metering. Using incident light metering to measure light, its reading is the exposure value of medium gray in the current environment; medium gray also represents the tone of the metering area when using reflective metering in the shooting environment of this negative film. Similar to incident light metering, the reading obtained by reflective metering is the exposure value of medium gray in the measurement area.

[0064] Based on the calculation of 18° gray, the visual density of medium gray of the reflective medium for the human eye , if the perceived density of the composite image medium at the metering point is close to the visual density of medium gray, it is regarded that the composite image medium can correctly represent the medium gray tone of the shooting scene.

[0065] Figure 2 (Transmitted light): When the photosensitive film (#1) prepared in Example 1 is viewed under transmitted light, the overall density of the picture is thin and the brightness is high, showing the typical characteristics of "overexposure + overdevelopment". This is because the film has been processed by overexposing 1 EV and extending the first development time, resulting in a low silver salt density and strong light transmittance in the final image.

[0066] Figure 3 (Reflected light): After the same film is laminated with barium oxide acid-free paper base paper and viewed under reflected light, the light and dark relationship of the picture is normal, with distinct levels, and can correctly reproduce the tone of the shooting scene. This is because the perceived density of the composite body is matched with the density of the reflective medium through formula calculation, achieving the visual effect of reflective viewing.

[0067] Example 2 This example provides a photosensitive film composite image medium, labeled as #2; The composite image medium of #2 is obtained according to the following preparation method: S1. Overexpose the photosensitive film to obtain an overexposed film; S2. The overexposed film is reverse-washed to obtain a visible image; S3. The visible image is bonded to the reflector to form a photosensitive film composite image medium.

[0068] The preparation method in this embodiment is basically the same as that in Example 1. The difference is that the ISO value of the photosensitive film in step 1 is 160, and the overexposure treatment method is to use a flash to take pictures, so the aperture is increased.

[0069] Steps 2-3 are basically the same as those in Example 1, except that the developing formula is D67, and the specific formula is shown in the table below.

[0070] Table 1: Developer formulation

[0071] Add water to 1000 mL to obtain the developing solution.

[0072] Take 300ml as the working solution and use it to develop the comparative film.

[0073] The photosensitive film composite image medium #2 was obtained, and the final photosensitive film, viewed in transmission mode, is as follows: Figure 6 As shown, the image obtained after laminating the photosensitive film with the same barium sulfide-coated acid-free paper base photographic paper as in Example 1 is as follows. Figure 7 As shown.

[0074] Figure 6 (Under transmitted light): Example 2 uses 2EV overexposure and D67 developer. The film also shows the characteristics of thin density and bright image under transmitted light.

[0075] Figure 7 (Under reflected light): The reflection viewing effect is good after bonding, and the image layer is clear, indicating that even when using the standard D67 formula, as long as overexposure processing is used, a low-density image suitable for reflection viewing can still be obtained.

[0076] Comparative Example 1 This comparative example provides a method for processing photographic film: Specifically, in Comparative Example 1, the information of the photosensitive film is the same as in Example 1. In step 1, a normal exposure method is used, that is, a certain type of ISO160 black and white film is photographed using direct photography. A reflective light meter is used to meter the subject at ISO160, and the exposure parameters are obtained as shutter speed 1 / 60s and aperture F8.

[0077] In step 2, the overexposed film is reverse-washed to obtain a visible image; the developing formula is D67, as shown in the table below.

[0078] Table 2: Developer formulation

[0079] Add water to 1000 mL to obtain the developing solution.

[0080] Take 300ml as the working solution and use it to develop the comparative film.

[0081] The final photographic film, viewed in transmission mode, is as follows: Figure 4 As shown, the image obtained after laminating the photographic film with acid-free paper base coated with barium sulfide is as follows. Figure 5 As shown.

[0082] Figure 4 (Under transmitted light): Comparative Example 1 was exposed normally (without overexposure) with D67 developer, and no density control was performed. The image density was normal when viewed through transmitted light, which meets the viewing standards of traditional reversal film.

[0083] Figure 5 (Under reflected light): When the same film and photographic paper are laminated together, the image appears darker and less detailed when viewed under reflected light, resulting in a visual effect of "overly thick negative." This is because film that has not undergone exposure and density control has a higher transmission density. After lamination, too much reflected light is absorbed, leading to an excessively high perceived density, making it unsuitable for reflective viewing.

[0084] Comparative Example 2 This comparative example provides a method for processing photographic film: Specifically, in Comparative Example 1, the information of the photosensitive film is the same as in Example 1. In step 1, a normal exposure method is used, that is, a certain type of ISO100 black and white film is photographed using direct photography. The overexposure method is: using a flash to take pictures, so the aperture is increased to take pictures.

[0085] In step 2, the overexposed film is reverse-washed to obtain a visible image; wherein the developing formula is D72. The formula of the D72 developing solution is shown in the table below.

[0086] Table 3: D72 Developer

[0087] The above components were further diluted with water to 1000 ml to obtain the developing solution.

[0088] Take 300ml of it as the working solution for this comparative example.

[0089] The final photographic film, viewed in transmission mode, is as follows: Figure 8 As shown, the image obtained after laminating the photosensitive film with acid-free pure cotton art paper is as follows. Figure 9 As shown.

[0090] Figure 8 (Under transmitted light): Comparative Example 2 was exposed normally and developed with D72 developer (without potassium thiocyanate). The image density was normal when viewed through transmitted light.

[0091] Figure 9 (Under reflected light): The viewing effect after lamination is poor, the overall image is too dark and lacks detail, appearing as if the film is "too thick". This indicates that normal exposure alone, plus a potassium thiocyanate-free developer, cannot achieve the density control suitable for reflective viewing.

[0092] For ease of comparison, the parameter information of Examples 1-2 and Comparative Examples 1-2 is summarized in the table below.

[0093] Table 4: Parameter information of Examples 1-2 and Comparative Examples 1-2

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a composite image medium of a photosensitive film, characterized by, The method comprises the following steps: S1, overexposure processing of the photosensitive film to obtain an overexposed film; S2, reversal development of the overexposed film to obtain a visible image; S3, bonding the visible image with a reflector to form a photosensitive film composite image medium.

2. The method for preparing a photosensitive film composite imaging medium according to claim 1, characterized in that, The overexposure processing step is: first, determining a reference exposure parameter according to the ISO value information of the photosensitive film, the reference exposure parameter including an aperture value and a shutter value, and then adjusting the shooting parameter to an overexposure state based on the reference exposure parameter.

3. The method for preparing a photosensitive film composite imaging medium according to claim 1, characterized in that, The reversal development includes first development, and the negative density generated by the first development is greater than the conventional standard by extending the first development time or increasing the development activity.

4. The method for preparing a photosensitive film composite imaging medium according to claim 3, characterized in that, The apparent density of the photosensitive film satisfies the following formula: ， Wherein, D represents the apparent density, d0 represents the base density of the photosensitive film; d1 represents the transmission density of the photosensitive film emulsion layer; d2 represents the reflection density of the reflector, C represents an illumination constant related to the viewing environment illumination angle; The apparent density matches the reflection density of the ordinary reflective medium.

5. The method for preparing a photosensitive film composite imaging medium according to claim 4, characterized in that, C is positively correlated with the illumination angle, and the illumination angle ranges from 0° to 90°, and 0 < C < 0.

3.

6. The method for preparing a photosensitive film composite imaging medium according to claim 3, characterized in that, In the first development step, the first development solution contains potassium thiocyanate, and the concentration of the potassium thiocyanate is not less than 2 g / L.

7. The method for preparing a photosensitive film composite imaging medium according to claim 6, characterized in that, The first development solution adopts D67 formula, and the composition of the D67 first development solution includes the following raw materials by weight: Mettol 2 g, hydroquinone 8 g, anhydrous sodium sulfite 90 g, anhydrous sodium carbonate 48 g, potassium bromide 5 g, potassium thiocyanate 2 g, and water to 1000 mL to obtain the D67 first development solution.

8. The method for preparing a photosensitive film composite imaging medium according to claim 1, characterized in that, The reflector is acid-free paper-based photographic paper, and the model of the acid-free paper-based photographic paper includes any one of barium oxide coated acid-free paper-based photographic paper, barium sulfide coated acid-free paper-based photographic paper, and pure cotton acid-free art paper.

9. A photosensitive film composite image medium, characterized by comprising: The preparation method according to any one of claims 1-8.

10. Use of a photosensitive film composite image medium, characterized in that The photosensitive film composite image medium of claim 9 is displayed or viewed in a common non-transmitted light source environment.

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