RMagick 2.2.0 adds the opaque_channel, paint_transparent, and liquid_rescale methods to the Image class. This release also includes fixes for two bugs. The first bug caused some older versions of gcc to stop with an error message when compiling RMagick (reported by Trever Wennblom). The second bug caused the get_exif_by_entry and get_exif_by_number methods to fail when called with at least one argument.