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2006.12.05 23:13 "Re: Grayscale, or is it?", by Bob Friesenhahn
On Tue, 5 Dec 2006, Jean-Yves Le Ridant wrote: > > From the extract from the spec you have posted, I understand "linear" > at his usual meaning in most papers from CIE or ICC, that is, linear > combination of XYZ so at gamma 2.2 distance of sRGB, 1.8 from Apple, > 3.0 of L .... > > That's entertainement :-) It is true that the notion of "linear" is not well defined. A video engineers notion of "linear" differs from the 3D renderer's notion of "linear". To the broadcast engineer, gamma corrected video can be considered "linear" since each quantization step is proportionally brighter to the human viewer. But for purposes of rendering and sensing, "linear" means "linear light". Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/