IJP-Color is a set of plugins for ImageJ for color calibration and other operations on color images. The code can also be used as a library outside of ImageJ UI.
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IJP Color Calibrator - can color calibrate an images using an a color chart.
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IJP Color Calculator - tool to convecting individual color values between different color spaces.
The source code is located in GitHub ij-plugins project
Information about releases, including download, is available from the ij-plugins releases page.