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Add and Subtract are the two most basic Blend Modes, but they can be a bit hard to use. As their names suggest, Add can only increase - or brighten values, Subtract can only decrease - or darken values. Both Add and Subtract can give you harsh results, so lets try to understand them better. Add is the simpler of the two. Thats because with Add, the order of your images doesnt matter. If you swap your bottom with your top image, the result is still the same. We call this behavior commutative: whatever the order, the result is the same. When building a Mask, Add brings in more white, visible areas, like detail spots, or dirty specks and splotches. Add combines the white areas from both components, adding the white from the top and the bottom together. Though you shouldnt expect areas that are already white to change. Our value range is limited to 1, or white, so going higher is impossible when using Low Dynamic Range. For Height maps, Add works like an
