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+---- Thread: Script-fu How Write Colors-Auto-White Balance (/Thread-Script-fu-How-Write-Colors-Auto-White-Balance)
Script-fu How Write Colors-Auto-White Balance - James Parkinson - 12-02-2022
I have not found a way to write Colors-Auto-White Balance within Script-fu. Please advise how to do this.
RE: Script-fu How Write Colors-Auto-White Balance - Ofnuts - 12-02-2022
Why do you need to write it since it is already written? Or you need to reproduce it? As far as I can tell the core is (gimp-drawable-color-balance drawable transfer-mode preserve-lum cyan-red magenta-green yellow-blue) with some heuristics (possibly using (gimp-drawable-histogram drawable channel start-range end-range) on each RGB channel) to determine how to change the color balance.
RE: Script-fu How Write Colors-Auto-White Balance - James Parkinson - 12-02-2022
(12-02-2022, 06:16 PM)Ofnuts Wrote: Why do you need to write it since it is already written? Or you need to reproduce it? As far as I can tell the core is (gimp-drawable-color-balance drawable transfer-mode preserve-lum cyan-red magenta-green yellow-blue) with some heuristics (possibly using (gimp-drawable-histogram drawable channel start-range end-range) on each RGB channel) to determine how to change the color balance.
Much thanks for sharing your knowledge.
I was needing to process batches of photos. The GIMP interactive is too slow.
The Colors-Auto-White Balance is not understood by myself. You have an understanding of what Auto-White Balance in detail is doing, which I don't possess.
If convinent please breakdown your script and explain its parts.
RE: Script-fu How Write Colors-Auto-White Balance - rich2005 - 12-02-2022
It is difficult for Gimp new-comers to get into scripting. In all the years I have used Gimp, I think I only once got a script-fu batch to work
There is a GUI option BIMP see: https://alessandrofrancesconi.it/projects/bimp/ There is a Windows installer. Read the info on the site, examples are shown.
You can add a folder of images
[attachment=9108]
Use other Gimp procedure and search for auto. It say it is deprecated but works anyway
[attachment=9109]
Always best to export to another folder "just in case"
[attachment=9110]
Set it going, BIMP does not break any speed records but better than one-at-a-time
However, if you need a script-fu procedure, I am sure Ofnuts will assist.
RE: Script-fu How Write Colors-Auto-White Balance - James Parkinson - 12-02-2022
I am familar with BIMP.
The Auto-White Balance at its details is a mystery, in otherwords propriatary information. I need to understand how it works to replicate it with script-fu.
I will make it a project to be completed someday.
Much thanks for your help.
RE: Script-fu How Write Colors-Auto-White Balance - tmanni - 12-03-2022
Gimp is a free software, so everything is freely available online, there is no "propriatary information".
The description of what happens is in the documentation : https://docs.gimp.org/en/gimp-layer-white-balance.html
The implementation of the algorithm is here and deeper here.