Re: [Gimp-developer] Don't make an architectural mistake based on a groundless premise

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On 10/04/2014 11:59 AM, Øyvind Kolås wrote:
On Sat, Oct 4, 2014 at 2:46 PM, Elle Stone
<ellestone@xxxxxxxxxxxxxxxxxxxx> wrote:
Based on the groundless premise that editing operations should
produce the
same results when performed on the same colorimetric colors, ..


I'm not sure what you are saying "No" to. Here are excerpts from previous posts that you've made talking about the matter:
My stance is that the sliders on an
operations should be predictable and always do the same thing for the
colorimetrically absolute same color
GEGLs image processing is intended to all operate in device independent
color spaces, no matter which camera you took a picture with
gaussian blurs, color adjustments etc, should behave the same.

No; but same parameters for same input colors producing same results
is considered desirable behavior. Predictable interfaces are nice

In a properly color managed image editor, the way for a user to get predictable editing results is to set up a consistent workflow based on the RGB working spaces that the user finds appropriate for the tasks at hand.

Edit 50 ProPhotoRGB images in a row and results will be predictable for anyone using a ProPhotoRGB workflow.

Edit 50 sRGB images in a row and results will be predictable for anyone using an sRGB workflow.

The real question is why anyone would want to edit ProPhotoRGB images in GIMP, given GIMP's sRGB "PCS". Results certainly won't be consistent with editing ProPhotoRGB images in any other image editor.

Instead, after converting the ProPhotoRGB image to GIMP's sRGB "PCS", editing results will depend entirely on how many operations the GIMP devs choose to "special case" by converting to a target profile made using ProPhotoRGB primaries, as seems to now be the plan for "multiply".

Until GIMP is properly color managed, the only users who might find GIMP editing results predictable are users who already only edit their images in the sRGB color space.

Elle Stone
Color management and free/libre photography
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