Re: [Gimp-user] User's Guide to High Bit Depth GIMP 2.9

[Elle Stone <ellestone ninedegreesbelow com>]

On 11/02/2014 08:35 AM, Partha Bagchi wrote:
> Elle,
>
> What are your thoughts on the 64-bit precision now in Gimp?

At some point in the not too distant past I asked about the 64-bit 
precision options. As I recall, the answer was that 64-bit precision 
options are to accomodate (I think) the FITS file format, which can be 
at 64-bit precision. But the actual GEGL calculations are at 32-bit 
floating point.

> Also, (I know, I shouldn't ask :) ) are the patches already in the
> current trunk?

My apologies, I'm not sure which patches you are asking about. The 
openexr patch? I filed a bug report but don't remember if I attached a 
patch or not. The patch to retrieve Y and XYZ info from the image ICC 
profile? I did attach a patch to the bug report. Some other patch?

Elle

> Thanks,
> Partha
>
>
> On Sat, Nov 1, 2014 at 7:40 AM, Elle Stone
> <ellestone ninedegreesbelow com> wrote:
> > I posted a "User's Guide to High Bit Depth GIMP 2.9" to my website.
> >
> > Some of the GIMP 2.9 code still uses hard-coded "sRGB-only" parameters.
> >
> > Consequently, if you use GIMP 2.9 to edit images in wider gamut RGB working
> > spaces such as ProPhotoRGB or AdobeRGB1998, the affected editing operations
> > produce incorrect results.
> >
> > The "User's Guide" tells you which editing operations to watch out for and
> > also provides some workarounds.
> >
> > Some of the workarounds are simple, and some require making small
> > modifications to the source code and then recompiling babl/GEGL/GIMP.
> >
> > Here's the link:
> > http://ninedegreesbelow.com/photography/users-guide-to-high-bit-depth-gimp.html
> >
> > The Guide talks about color management and so gets a bit technical in
> > places. So if anyone has questions, please ask and I'll do my best to answer
> > them.
> >
> > Best regards,
> > Elle Stone
> > --
> > http://ninedegreesbelow.com
> > Color management and free/libre photography
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