abrupng extracts image brushes from Adobe Photoshop's ABR files and saves them as PNGs.
abrupng is written in Rust. Make sure you have Rust and Cargo installed.
$ cargo install --git https://github.com/scurest/abrupng.git
$ git clone https://github.com/scurest/abrupng.git
$ cd abrupng
$ cargo build --release
Basic usage is
abrupng path/to/mybrushes.abr
which will create a directory called mybrushes in the current directory containing the extracted brush images (0.png, 1.png, etc.). You may also specify the output location with -o
abupng path/to/mybrushes.abr -o my/new/brush/dir
abrupng will create the output directory; it should not exist beforehand. (This is just so that it won't clobber any of your files.)
The brush images will be 8-bit greyscale PNG files. Black represents transparency. This is the opposite convention of the one used by GIMP, so if you want to import the images as GIMP brushes you'll need to invert them first. (Using Imagemagick, you can do this in-place with mogrify -negate my/new/brush/dir/*.)
abr + abrupt + png = abrupng?
...it was previously very logically called abr2png, but it turns out there was already ZZYZX/abr2png, which fact incidentally would have been nice to find out sooner. (How did I not google that?)
abrupng was derived from gimp-brush-load.c in GIMP 2.8. It consequently is licensed under the GNU General Public License v3.0.