Multi-ink Print Head Color Correction via Dot Area Adjustment

The patent divides the correction approach into two distinct segments: head-shading correction for individual ink color density uniformity, and a new color-specific correction mechanism for multi-ink color uniformity. This segmentation allows each correction type to be optimized independently, resolving the contradiction between density correction capability and color correction capability.

The patent transitions from one-dimensional head-shading correction (adjusting dot count per nozzle) to a multi-dimensional correction approach that considers both the number of print dots and the area of print dots. By adding the area dimension to the correction parameters, the system can now address color uniformity issues that were previously unsolvable with head-shading alone.

The patent performs color-specific correction in advance before final image rendering. By pre-calculating the appropriate number and area of print dots for each color channel based on measured nozzle characteristics, the system ensures color accuracy is established early in the processing pipeline, preventing color errors from propagating through subsequent rendering stages.

The patent introduces an intermediate correction layer between the head-shading correction and the final image rendering. This intermediate layer applies color-specific adjustments by modifying both dot count and dot area, acting as a mediator that refines the output from density correction alone into accurate color reproduction.