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From: Olivier Paquet <olivier.paquet@gmail.com>
Date: Fri, 11 May 2018 12:43:34 -0400
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To: Larry Gritz <lg@larrygritz.com>
Cc: TIFF mailing list <tiff@lists.maptools.org>
Subject: Re: [Tiff] Question about transfer function
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2018-05-11 11:51 GMT-04:00 Larry Gritz <lg@larrygritz.com>:
> My much more modest wish would simply be to have a string ColorSpace tag,
> that names an externally-referenced color configuration. While I understand
> the desire to support a fully embedded arbitrary transfer function, for most
> uses in a closed pipeline it seems wasteful to be required to fully embed
> what may be many MB of LUTs in every image file separately, especially when
> most files are either a canonical choice like "ACEScg_linear" or "sRGB", or
> a name in the facility's OCIO configuration.

That's more or less what we chose to do several years ago but on a
smaller scale (only a handful of built-in spaces supported). As there
was no tag for it, we stuffed the information in
TIFFTAG_IMAGEDESCRIPTION. I'm not saying it's great... but embedding
the whole thing into each single image is indeed not great either. I
like the idea of a dedicated tag to reference an OCIO color space.

Olivier
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