On 2018-08-07 15:47, Matthew Woehlke via gimp-user-list wrote: > I want to apply mantiuk06 to a really big image. However, using the > GEGL CLI, I get very different results than when I apply the filter > from within gimp as compared to using the GEGL CLI. See [1]: left is > original, middle is mantiuk06 applied from within gimp, right is > mantiuk06 applied via GEGL CLI. > > What is gimp doing differently from GEGL CLI, and is there a way to get > the gimp results with the GEGL CLI? > > [1] > https://gitlab.gnome.org/GNOME/gegl/uploads/e1e40b302523405d10f1234eec1edbeb/roses.png
To forward Massimo's answer from https://gitlab.gnome.org/GNOME/gegl/issues/94, it seems gimp (2.8) and GEGL CLI disagree about whether the image is in a linear or gamma-corrected color space, and one is adding an implicit conversion. While this is an "improvement" for some operations (for mantiuk06, it's hard to argue that the GEGL result isn't more "correct", although stylistically I prefer the "wrong" result in some cases), for many others it ranges from dubiously, to *definitely*, worse. In particular, stress tends to produce a washed-out result. (I mention this mainly because it is my impression that gimp 2.10 behaves the same was as GEGL CLI, though it sounds as if there is an option to control this. PLEASE KEEP THAT OPTION!) At any rate, the literal answer to my question is: gegl <in> -o <out> \ cast-format input-format="R'G'B' u8" output-format="RGB u8" \ <operation> <options> \ cast-format input-format="RGB u8" output-format="R'G'B' u8" ...which does indeed produce the same results as gimp (2.8). \o/ -- Matthew _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
