The GIMP is capable of loading and saving images which have been gzip compressed. In order to save a gzipped file, either Save By Extension or the gz extension can be used. The file must be named in a similar format to: filename.extension.gz, where extension is an extension for a supported file format.
For this plug-in to work, the gzip application is required. To check if this application is present, type gzip --version in a terminal window. If there is output similar to: gzip: command not found then gzipis not installed, and can not use this plug-in.
gzip is available from The gzip Homepage .