Color inversion in digital image processing is done by inverting all color element. For monochrome image, the dark pixel in the original image will be the bright pixel in the inversed image. The effect show horizontal mirroring in the histogram.
The GST function is simple, the Intensity of the output Io=Imax-Ii, where Imax is the maximum Intensity value, and Ii is the input pixel's intensity. The maximum intensity value is 255 for 8bit monochrome or 24bit true color. For 24 bit true color, each RGB elements is operated independently.
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