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I'm using GIMP 2.10.2 and there is an option here for Colors>Desaturate>Color To Gray which works nicely by removing unnecessary gray shades from the photo.

However, I have about 200 photos which need to be processed this way, so I tried to use Python-Fu scripts to batch process multiple files. However, I can't seem to find this particular script to call this function.

There is GIMP-drawable-desaturate which doesn't really work too well. Does anyone know of a PDB script for the "Colors>Desaturate>Color To Gray"

Thanks,

  • If the GEGL code can not be scripted you may see if there is a GMIC-filter that meets your needs. GMIC filters are scriptable. – Takkat Sep 7 '18 at 7:39
  • You can also use Imagemagick for such an operation. – Paolo Gibellini Sep 7 '18 at 7:51
  • @xenoid Indeed, I've tested the function and works fine, but I'm unsure of the needs of Dave. I hope that API for GEGL tools will be available one day. – Paolo Gibellini Sep 7 '18 at 13:53
  • @PaoloGibellini Thanks for the tip, I took a look at Imagemagick, but I couldn't really find an equivalent to the "Color to Gray" tool. To expand on my needs, the photo is pages from a book with some texts and pictures on it which I want to print out, so I want to remove shadows, and highlight the text. I found the C2G the best for this. Unfortunately, it looks like it cannot be done at the moment, so I might have to do this manually for each picture – Dave Sep 8 '18 at 1:18
  • You can also use a script invoking GEGL command-line executable, chaining the available operations. You can find here an example of the use of GEGL with c2g option. I've performed a few quick test on Windows and sometimes I got a buffer error when the process was almost ended, resulting in some points unprocessed. I suggest you to give a look. – Paolo Gibellini Sep 11 '18 at 9:35
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C2G is more than Color>Desaturate, it also does some form of grayscale HDR/tone-mapping, so the usual desaturation techniques are not a replacement.

Unfortunately, at the same time C2G is part of a set of "GEGL tools" for which there is currently no API in Gimp, so I don't think there is a way to code the equivalent of C2G in a script, until these tools have a matching scripting API.

  • Please add this information to your short answer to expand it. Then we can remove these comments. – Ovaryraptor Sep 7 '18 at 15:45
  • GEGL provides a command-line executable, which can be used in scripts. Can you update your answer, please? – Paolo Gibellini Sep 11 '18 at 9:37

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