Re: [Gimp-developer] lcms high bit depth update: now that it works, adding and improving functionality

[Michael Henning <drawoc darkrefraction com>]

The idea would be to write a babl extension that links to lcms (or a
similar lib), and uses that to do conversions under the hood.

babl should not require lcms, so it would be conditionally compiled
when lcms is present.

  -- drawoc

On Sun, Jan 13, 2013 at 7:27 PM, Graeme Gill <graeme2 argyllcms com> wrote:
> Michael Henning wrote:
>> I want a generic mechanism to
>> take any ICC profile and turn it into a babl format. Øyvind indicated
>> that this is similar to how indexed formats already work (take a
>> palette and turn it into a babl format), so this wouldn't need vast
>> amounts of new code.
>
> Take a look at the ICC file format. It is not something simple
> like a palette, it has about 34 different tag types, many of which
> are non-trivial to parse, represent and use. (The ICC also has
> a number of addition tag types such as floating point and spectral
> data tags waiting in the wings.) Why would you want to write (and
> maintain in the face of ICC format changes) duplicates of all the
> proven and tested logic that already exists in libraries like lcms,
> icclib etc. to parse and interpret ICC profiles ?
>
> If you want to tag a colorspace when it is defined by an ICC profile,
> then the simplest thing to do is to tag it with the ICC profile. Store
> (or reference) the profile. Use all the existing ICC format code
> out there. Don't start on a mountain of a project to turn an ICC profile
> into some other format, unless you have an absolutely compelling reason,
> and lots of time on your hands...
>
> Graeme Gill.
>
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