GIF is referred to as 'lossless' compression format because when it shrinks a graphic, it remembers what data it removed from the original graphic file and adds it back whenever the file is redisplayed. PICT is a file format developed by Apple Computer in 1984. It is supported by all graphics programs that run on Macintosh computers. Some applications with Macintosh computers require PICT format and will even convert some GIF and JPG files to PICT format when importing the files into the Macintosh applications. GIF does significantly better on images with only a few distinct color, such as line drawings and simple cartoons.
Many software applications allow saving or converting graphics in multiple formats.
Some do not. Graphic Converter, below, is a very handy application to convert graphics from one format to another, as well do some editing. Click on the Graphic Converter Icon. When you first open it, it will take a few moments for the screen to appear. When you see the words Try It appear, and turn black , click on that button.