An S-shaped curve with a toe and shoulder fitted to photographic film response, which holds saturation in the highlights where a simple ratio curve washes out.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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alternative-tois a competing approach to Reinhard Tone Mappingan S-curve with a toe, matching film response
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extendsACES adds capability to thisa whole managed pipeline, not just an output curve