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Difference mode Inversion
Normal blending for reference
Difference Subtracts blended color from underlying colors; if result is negative, it is being inverted. Pure white inverts underlying colors (produce negative image); black is transparent. Similar colors cancel each other to black. However not very practical for artistic effects, this mode is extremely useful for aligning two similar layers: the differences between layers appear as contrasty monochrome image. When both layers are identical, the image gets uniformly black. This allows to visualize even single-pixel differences.
Infinite Painter’s Manual
ref: manual_listings_blending_modes_difference
Appendices • Color blending modes • Page 473
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