2006.12.05 15:52 "[Tiff] Grayscale, or is it?", by Joris Van Damme
Thread
2006.12.05 22:10 "Re: [Tiff] Grayscale, or is it?", by Frank Warmerdam
So it seems we have at least two people agree on the fact that greyscale is R=G=B, assuming RGB is sRGB, is the common practice, though it seems to violate a small remark in the spec, and that people would generally speaking do well to follow this common practice.
So, that's option 1) in my original post...
Joris,
I concur from a "common usage" point of view. I must admit that this color theory stuff about gamma values and so forth is all greek to me.
Best regards,
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