Image Forming Apparatus Brightness Correction Chromatic Achromatic Transition
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Solution Overview
Problem
Existing image forming apparatuses experience brightness discontinuity when transitioning from chromatic to achromatic colors due to the use of separate color conversion and black conversion processing methods, which fail to maintain consistent brightness.
Innovation Solution
An image forming apparatus and method that include a brightness correcting unit to ensure the brightness of black single color data matches the brightness of second color data, using both color conversion and black conversion processing to combine image data smoothly from chromatic to achromatic colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the method of emphasizing chroma and contrast is used for color conversion processing, then chroma and contrast are enhanced, but brightness continuity is lost causing brightness discontinuity at boundaries
Solution Approach 1:
A brightness correction unit is introduced as an intermediary component between the color conversion processing unit and the image formation unit. This mediator receives the color-converted image data, detects brightness discontinuities at boundaries between chromatic and achromatic areas, and corrects them by adjusting brightness values, thereby maintaining brightness continuity while preserving the chroma and contrast enhancement benefits
Solution Approach 2:
The invention dynamically adjusts the brightness parameter of image data based on the detection of brightness discontinuities. By changing the brightness parameter selectively at boundary regions between chromatic and achromatic areas, the system maintains both the enhanced chroma/contrast from the color conversion and the continuity of brightness across the entire image
2Productivity
If separate color conversion and black conversion processing are used, then processing efficiency is improved, but brightness discontinuity occurs at transition boundaries
Solution Approach 1:
The brightness correction unit serves as an intermediary that bridges the separate color conversion and black conversion processing streams. It receives output from both processing paths, detects mismatches in brightness at their boundaries, and applies corrective adjustments to ensure seamless transitions, thereby maintaining both processing efficiency and brightness consistency
Solution Approach 2:
The system implements a feedback mechanism where the brightness correction unit continuously monitors brightness values at boundaries between chromatic and achromatic areas. When discontinuities are detected, the unit provides feedback by adjusting brightness parameters to eliminate the discontinuity, ensuring that the separate processing paths produce visually consistent results
Data Source
AI summary
An image forming apparatus according to the invention is characterized by including; an input unit that inputs first color data; a first color converting unit that converts the first color data into a black single color data; a second color converting unit that converts the first color data into second color data; a brightness correcting unit that corrects brightness of the black single color data such that brightness of the black single color data converted by the first color converting unit is equal to brightness of the second color data converted by the second color converting unit; and an image forming unit that prints image data on a recording medium. According to the image forming apparatus, in the image forming apparatus that uses both color conversion processing and black conversion processing, even if image data continuously changes from a chromatic color to an achromatic color, it is possible to reduce “brightness discontinuity”.