Originally Posted by
SergeyT
3. The effect of conversion looks similar to that obtained in Photoshop with either "Subtract" or "Divide" of a layer filled with unexposed border color. The converted image blacks are at r=0, g=0, b=0 (clipped) and white point requiring significant tuning (with Auto Color (Enhance per Channel Contrast; No "Neutralize the mid-tones")). Visually and practically (math and algorithms aside), in my opinion, a simple combination of 2 layers (Invert) + (Curves with Enhance per Channel Contrast; No "Neutralize the mid-tones") provide for more flexibility in balancing the collors as neither Blacks nor Whites appear to be clipped.
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