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December 2006

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2006.12.05 15:52 "Grayscale, or is it?", by Joris Van Damme
2006.12.05 17:18 "Re: Grayscale, or is it?", by Bob Friesenhahn
2006.12.05 17:34 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.05 17:45 "Re: Grayscale, or is it?", by Bob Friesenhahn
2006.12.05 18:44 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.05 22:10 "Re: Grayscale, or is it?", by Frank Warmerdam
2006.12.05 20:37 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.05 21:16 "Re: Grayscale, or is it?", by Edward Lam
2006.12.05 21:30 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.05 22:28 "Re: Grayscale, or is it?", by Edward Lam
2006.12.05 22:41 "Re: Grayscale, or is it?", by Jean-yves Le Ridant
2006.12.05 23:13 "Re: Grayscale, or is it?", by Bob Friesenhahn
2006.12.05 23:29 "Re: Grayscale, or is it?", by Phillip Crews
2006.12.06 02:05 "Re: Grayscale, or is it?", by Graeme Gill
2006.12.05 22:56 "Re: Grayscale, or is it?", by Glenn Widener
2006.12.05 23:26 "Re: Grayscale, or is it?", by Toby Thain
2006.12.06 01:58 "Re: Grayscale, or is it?", by Graeme Gill
2006.12.06 04:45 "Re: Grayscale, or is it?", by Edward Lam
2006.12.06 20:56 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.06 22:19 "Re: Grayscale, or is it?", by Graeme Gill
2006.12.06 23:30 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.07 01:28 "Re: Grayscale, or is it?", by Graeme Gill
2006.12.07 07:45 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.06 20:56 "Re: Grayscale, or is it?", by Joris Van Damme
2006.12.06 21:57 "Re: Grayscale, or is it?", by Graeme Gill

2006.12.05 23:26 "Re: Grayscale, or is it?", by Toby Thain

> The standard conversion from RGB to gray, documented in the  
> textbooks, is grey level =  .33R+.5G+.17B.  So a unitary conversion  
> back to RGB is fine.

Many systems - such as PostScript - use the NTSC coefficients, see  
http://poynton.com/notes/colour_and_gamma/GammaFAQ.html#luminance ,  
http://en.wikipedia.org/wiki/Luminance_(video)

--Toby