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2006.12.05 17:18 "Re: [Tiff] Grayscale, or is it?", by Bob Friesenhahn
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2006.12.05 17:34 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme
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2006.12.05 17:45 "Re: [Tiff] Grayscale, or is it?", by Bob Friesenhahn
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2006.12.05 18:44 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme
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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
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2006.12.05 22:10 "Re: [Tiff] Grayscale, or is it?", by Frank Warmerdam
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2006.12.05 18:44 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme
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2006.12.05 17:45 "Re: [Tiff] Grayscale, or is it?", by Bob Friesenhahn
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2006.12.05 17:34 "Re: [Tiff] Grayscale, or is it?", by Joris Van Damme
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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 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
2006.12.06 21:57 "Re: [Tiff] Grayscale, or is it?", by Graeme Gill
I'm forever having trouble with grayscale in TIFF, except that now I really need to resolve it and make a final descision.
I see three possibilities.
[I sent this yesterday, but it seems to have gone via the
bit bucket...]
You've left out possibility 4) - in the printing world, greyscale is the K (black) channel. It's response is whatever the printing system I'm using it on is. Note that it has the opposite sense to an additive display's response (0.0 = white, 1.0 = black).
The reality is that people abuse the image transportation mechanism (ie. TIFF, PostScript etc.) to transport their device dependent data, and don't really care whether they've labelled it accurately or not. Officially in PostScript, the device grey is meant to be an additive, "gamma = 2.2" type space, but in practice people with a printing bent simply invert their K data, and call it "grey".
The modern approach is to transport the device dependent colorspace data, and label it with an ICC profile.
Graeme Gill.