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Is there a good tutorial for GIMP 2.8 software, that explains, comprehensively, how to use the GEGL operations (which have the the advantage of being nondestructive) for photo images?

When I look for tutorials, I find only very basic tutorials or some documentation that is targeted to developers, or deprecated stuff. I am interested in using the GEGL enabled features in GIMP for photo ediing, from the perspective of an end user. At this time, this is poorly documented.

I want to do only tasks of intermediate complexity in GIMP, e.g. retouching, clipping, layering. No color space conversions, no algorithmical, context-dependent void-filling etc

  • I think this question does not belong here, being very much a software-development question (use of a sofware API). – TFuto Apr 7 '14 at 14:42
  • No, not a software development question, I just want to use GEGL-enabled GIMP features, as an end user interested in photo editing – knb Apr 7 '14 at 16:52
  • Could you give an idea of what you mean, why CEGL-specific documentation is important? Excuse my ignorance. – wwkudu Apr 10 '14 at 5:22
  • You can do imaging operations in a reversible manner, even after saving and re-opening. At this time GIMP's GEGL operations are in a single Menu (Tools/GEGL operation...) without much grouping, and some operations don't work so well. I just tried the "Rotate" operation, and the values were pre-poulated with idiotic defaults (after setting them manually it works). Still it is a usability nightmare, and maybe someone has worked out a set of clever customizations and best practices. – knb Apr 10 '14 at 7:21
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    For the records, these operations do not work non-destructively in GIMP 2.8 yet. They are more comparable to the existing tools. – Michael Schumacher Oct 5 '15 at 12:54
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I think the basic answer here is: you see only seeing developer-oriented documentation because this is an unfinished feature. If you're looking for end-user documentation, wait for Gimp 3.10, where GEGL is the default, and then all of the up-to-date docs will automatically apply. (And, really, you probably won't need 'em, because it'll just be in-place replacements for all of the operations you are used to.)

This is particularly the case because the UI is also in current development with a lot of changes; end-user documentation really is premature.

If you are interested in trying this now, you could build your own (or on Fedora follow these instructions to enable Ryan Lerch's Copr containing development builds.

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