This format was developed by Apple for storing vector and bitmap images with metadata. It was the main format for the QuickDraw graphics software. PCT supports 32-bit and 24-bit images. At the moment, the format is obsolete and has been superseded by more functional solutions.
This is a vector images format created in a program for SK1 drawings, which was developed under Linux for open distribution. It contains vector graphics and is used for storing maps, brochures, logos and other illustrations. Today it’s used in vector graphics editors such as Sketch and Skencil.