A Color Correction Method for Soft Proofing

Abstract

The present invention proposes a method for correcting the displayed color of soft proofing. Firstly, the color mark image is printed, and each color block L is detected. * a * b * Values, converted to RGB values ​​and displayed on the screen, then take pictures with a digital camera to record the color code image displayed on the screen and the hard copy color code image pasted on the screen surface, extract the RGB value of the color block in the digital photo, and convert it to L * a * b * value, the L of the screen display color recorded by the camera * a * b * The value is an argument to detect the hard copy of the L * a * b * The value dependent variable establishes a mapping relationship, and then the L of the hard copy color block recorded by the camera * a * b * The value is an independent variable, and the output value is obtained, which is used to make the characteristic file of the simulated device, so that the color displayed on the screen is consistent with the color of the hard copy. The invention uses the hard copy color recorded by the camera under a specific ambient light source as a reference, corrects the display color recorded by the same camera under the same ambient light source, makes the display color approach the hard copy color, and realizes accurate screen soft proofing effect.

Description

technical field [0001] The invention relates to the field of color proofing in the printing process, in particular to a method for using screen simulation to display hard copy colors as a color reference in the printing process. Background technique [0002] Soft proofing refers to the method of using the display screen to simulate and display the color of the hard copy to realize the color proofing of the image reproduction process such as printing. Compared with traditional digital proofing, soft proofing is easy to use, can save the cost of printing equipment and printing consumables, and save the time and cost of printing and sample transmission. [0003] However, in the existing open color management technology of the International Color Consortium ICC, when printing equipment is characterized, the L of the hard copy is calculated with the D50 standard illuminant and a 2° field of view as the observation condition. * a * b * However, in actual production, the ambient...

AI Technical Summary

Problems solved by technology

This method can make up for the influence of screen reflected light on the display effect to a certain extent, but by measuring the reflectivity of the screen at a certain angle and the ambient light radiation power, the calculated tristimulus value of reflected light and the actual impact of reflected light on the human eye The difference is large, and the correction effect is not ideal

Images