I just realized something cool: GIMP supports (opens and saves to) compressed XCF files with the GZIP and BZIP2 compressions. I don't know since when, but GIMP 2.6 works and probably so does 2.
but
make sure you have the file-compressor plugin (I have yet to try the 2.8 release).
Here are some example compressions:
- example1.xcf: 1,2 MB (1.167.554 byte)
- example1.xcf.gz: 666,7 kB (666.746 byte)
- example1.xcf.bz2: 351,2 kB (351.215 byte)
- example2.xcf: 3,2 MB (3.244.705 byte)
- example2.xcf.gz: 595,0 kB (594.972 byte)
- example2.xcf.bz2: 541,7 kB (541.681 byte)
So I guess we can save a lot of storage and bandwidth if all the XCF files in the SVN would be compressed with either GZIP or BZIP2.