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W3C Glossaries

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gamma

From Portable Network Graphics (PNG) Specification (Second Edition) (2003-11-10) | Glossary for this source

exponent that describes approximations to certain non-linear transfer functions encountered in image capture and reproduction. Within this International Standard, gamma is the exponent in the transfer function from display_output to image_sample 
image_sample = display_outputgamma
where both display_output and image_sample are scaled to the range 0 to 1.
The Glossary System has been built by Pierre Candela during an internship in W3C; it's now maintained by Dominique Hazael-Massieux

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