How to convert XCF to PNG using GIMP from the command-line?

Question

As part of my build process I need to convert a number of XCF (GIMP\'s native format) images into PNG format. I\'m sure this should be possible using GIMP\'s batch mode, but I h

Answer 1

Here is my solution utilizing GIMP, GIMP's python-fu and bash. Note that GIMP's python-fu can only be run under a gimp process, not under plain python.

#!/bin/bash
set -e

while getopts df: OPTION "$@"; do
    case $OPTION in
    d)
        set -x
        ;;
    f)
        XCFFILE=${OPTARG}
        ;;
    esac
done

if [[ -z "$XCFFILE" ]]; then
    echo "usage: `basename $0` [-d] -f "
    exit 1
fi

# Start gimp with python-fu batch-interpreter
gimp -i --batch-interpreter=python-fu-eval -b - << EOF
import gimpfu

def convert(filename):
    img = pdb.gimp_file_load(filename, filename)
    new_name = filename.rsplit(".",1)[0] + ".png"
    layer = pdb.gimp_image_merge_visible_layers(img, 1)

    pdb.gimp_file_save(img, layer, new_name, new_name)
    pdb.gimp_image_delete(img)

convert('${XCFFILE}')

pdb.gimp_quit(1)
EOF