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

On 11/02/2014 08:35 AM, Partha Bagchi wrote:

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?



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:

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

Best regards,
Elle Stone
Color management and free/libre photography
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