Converting XCF and other files using command line with GIMP?

我们两清 提交于 2019-12-03 02:49:44

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).

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

convert image.xcf image.png

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.

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.

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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