High Quality Content by WIKIPEDIA articles! Seashore is an image editor for Mac OS X, which was influenced by the GIMP and written using the Cocoa API. Seashore uses GIMP`s native file format, XCF, and has support for a handful of other graphics file formats, including full support for TIFF, PNG, and JPEG, and read-only support for BMP, PDF and GIF. Seashore offers a smaller number of features in comparison with GIMP, including layers and alpha channel support, gradients and transparency effects, anti-aliased brushes, tablet support and plug-in filters.