Converting XCF and other files using command line with GIMP?

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忘了有多久
忘了有多久 2021-02-04 02:44

If I have an XCF file (or any other supported by Gimp) how can I convert it to, for example, PNG for display or further processing?

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  • 2021-02-04 03:23

    If you want to bulk convert .xcf images to .png, you might find this wrapper script more useful:

    #! /bin/bash -peux
    exec xcf2png $1 -o ${1%.xcf}.png
    

    Save it somewhere on your PATH as xcftopng (note the to instead of 2) and call it like so:

    ls *.xcf|xargs -l xcftopng
    
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  • 2021-02-04 03:25

    I guess ImageMagick should do what you want (and even more)

    convert image.xcf image.png
    
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  • 2021-02-04 03:38

    A very good solution (and explanations!) can be found here. In short, there is a bash script feeding scheme/lisp to gimp

    #!/bin/bash
    {
    cat <<EOF
    (define (convert-xcf-to-jpeg filename outfile)
      (let* (
         (image (car (gimp-file-load RUN-NONINTERACTIVE filename filename)))
         (drawable (car (gimp-image-merge-visible-layers image CLIP-TO-IMAGE)))
         )
        (file-jpeg-save RUN-NONINTERACTIVE image drawable outfile outfile .9 0 0 0 " " 0 1 0 1)
        (gimp-image-delete image) ; ... or the memory will explode
        )
    )
    
    (gimp-message-set-handler 1) ; Messages to standard output
    EOF
    
    for i in *.xcf; do
      echo "(gimp-message \"$i\")"
      echo "(convert-xcf-to-jpeg \"$i\" \"${i%%.xcf}.jpg\")"
    done
    
    echo "(gimp-quit 0)"
    } | gimp -i -b -
    

    But look at the page for the full story. It's worth it.

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  • 2021-02-04 03:39

    Very few, if any, programs other than GIMP read XCF files. This is by design from the GIMP developers, the format is not really documented or supported as a general-purpose file format.

    That being said, look into using GIMP itself, using command line arguments (especially the --batch option).

    EDIT: It looks as if ImageMagick does support XCF, so that is probably an easier route if the support seem so be good enough. I haven't tested it, and the documentation doesn't say much. I would be a bit wary.

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  • 2021-02-04 03:48

    I'm a couple of years late, but I thought I'd add what I think is by far the best solution: there is a tool suite called Xcftools (on Ubuntu, apt-get install xcftools), which has a utility called xcf2png that does this job perfectly.

    xcf2png image.xcf -o image.png
    

    This is much better than a) using ImageMagick (which as I said in a comment above is horribly broken), or b) using Gimp (which has an extremely complicated scripting language for simply exporting an image).

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