2018.05.09 03:45 "[Tiff] Question about transfer function", by Larry Gritz

2018.05.11 16:43 "Re: [Tiff] Question about transfer function", by Olivier Paquet

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.