Printer Driver Color Monochrome Determination Logic
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Solution Overview
Problem
Conventional printer drivers inaccurately determine the color/monochrome status of print data due to treating space characters and non-drawn characters with color settings as 'color', leading to incorrect processing modes, especially when external characters are involved.
Innovation Solution
An information processing apparatus and method that includes a character determination unit to differentiate between necessary and non-necessary characters to be drawn, and a color/monochrome determination unit that accurately assesses the color attribute based on typeface, space character codes, and glyph analysis to determine the correct color/monochrome status of print objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional printer driver determines color/monochrome status by only referring to the color attribute of each character, then the determination process is simple, but the determination accuracy deteriorates because non-drawn characters with color settings are incorrectly identified as color characters
Solution Approach 1:
The determination process is segmented into multiple stages: first checking if the character is a space character (which requires no drawing), then checking character codes, and finally checking color attributes. This segmentation allows the system to quickly identify non-drawn characters without performing complete color analysis, thereby improving accuracy while managing complexity through hierarchical filtering
Solution Approach 2:
The system performs preliminary checks before final color determination. Specifically, it first checks whether a character is a space character or has a character code that indicates no drawing is needed, before proceeding to check color attributes. This preliminary action prevents incorrect color determination for non-drawn characters while avoiding unnecessary complexity in the determination flow
2Measurement precision
If the printer driver performs complete color attribute analysis on all characters, then the determination accuracy is maintained, but the processing time increases
Solution Approach 1:
The character analysis process is divided into sequential segments: space character check → character code check → color attribute check. This segmentation enables the system to terminate analysis early for non-drawn characters (space characters and characters with special codes), avoiding unnecessary color attribute analysis and reducing processing time while maintaining accuracy for characters that require it
Solution Approach 2:
The system performs only the necessary portion of the determination process for each character type. For space characters and characters with special codes, it performs partial analysis (checking only the character type) rather than complete color attribute analysis, thereby reducing processing time without compromising the accuracy of the final determination
Data Source
AI summary
An information processing apparatus which is capable of efficiently performing color/monochrome determination of characters as a print object. A printer driver determines whether a character as the print object is a character which is necessary to be drawn or a character which is not necessary to be drawn. Then, when the character as the print object is determined to be a character which is not necessary to be drawn, the printer driver determines that the character as the print object is in monochrome.