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 At the moment, the format is obsolete and has been superseded by more functional solutions.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 file used for creating line plots in the form of vector images. They include text objects, splines, forms, arcs, lines and arrows. It can contain a set of colors, images and sketches. It was initially developed for the Xfig drawing program, but today it’s used in other drawing editors.