Thread

2006.12.05 15:52 "[Tiff] Grayscale, or is it?", by Joris Van Damme

2006.12.05 17:18 "Re: [Tiff] Grayscale, or is it?", by Bob Friesenhahn

2006.12.05 17:34 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme

2006.12.05 17:45 "Re: [Tiff] Grayscale, or is it?", by Bob Friesenhahn

2006.12.05 18:44 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme

2006.12.05 22:10 "Re: [Tiff] Grayscale, or is it?", by Frank Warmerdam

2006.12.05 20:37 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme

2006.12.05 21:16 "Re: [Tiff] Grayscale, or is it?", by Edward Lam

2006.12.05 21:30 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme

2006.12.05 22:28 "Re: [Tiff] Grayscale, or is it?", by Edward Lam

2006.12.05 22:41 "Re[2]: [Tiff] Grayscale, or is it?", by Jean-Yves Le Ridant

2006.12.05 23:13 "Re[2]: [Tiff] Grayscale, or is it?", by Bob Friesenhahn

2006.12.05 23:29 "Re: [Tiff] Grayscale, or is it?", by Phillip Crews

2006.12.06 02:05 "Re: [Tiff] Grayscale, or is it?", by Graeme Gill

2006.12.05 22:56 "[Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Glenn Widener

2006.12.05 23:26 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Toby Thain

2006.12.06 01:58 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Graeme Gill

2006.12.06 04:45 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Edward Lam

2006.12.06 20:56 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Joris Van Damme

2006.12.06 22:19 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Graeme Gill

2006.12.06 23:30 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Joris Van Damme

2006.12.07 01:28 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Graeme Gill

2006.12.07 07:45 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", by Joris Van Damme

2006.12.06 20:56 "[Tiff] Re: Grayscale, or is it?", by Joris Van Damme

2006.12.06 21:57 "Re: [Tiff] Grayscale, or is it?", by Graeme Gill

2006.12.05 23:26 "Re: [Tiff] Re: Tiff Digest, Vol 31, Issue 3", 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