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12. Acronym list
O = Original picture.
GB = GBn(O) = Gaussian Blur filter with nthradius applied to the Original.
SB = SBn(O) = Surface Blur filter with nth radius applied to the Original.
WLS = Weighted Least Square filter, a better edge-aware blurring operator not yet implemented in Photoshop.
SS1 = Subtraction via Calculation, using Scale = 1; implies a later LL blend 50% opacity.
SS2 = Subtraction via Calculation, using Scale = 2; implies a later LL blend100% opacity.
LL = Linear Light (blending mode).