Note that the colors with an overexposed channel (white and red, saturated in the red channel) can never be recovered fully. Results with the much improved ImageJ macro v1.2. Top row: originals, middle: result with full color calibration. Set of images taken under different sources of light (Canon G2 full auto mode). The supported charts are the MacBeth Color Checker Chart (A4 and small), and the QP201 chart. It will also compute the resolution of the pixels around and near the chart.
It is not a full color calibration, but it should bring the image closer to the sRGB color space. This macro will scale the color channels in an image based on the sRGB values of the black and white patch of a color chart in the image using a multipoint Lookup Table (LUT).
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