DCX is an image file format based on PCX. It supports multiple images in a single file, and may be used for fax images.
DCX files begin with a 4-byte signature.
Following that is a list of up to 1023 4-byte file offsets, terminated by an offset of 0.
Following that are the individual images, stored as embedded PCX files. The first one usually starts at file offset 4100 (0x1004).
Files begin with signature bytes
B1 68 DE 3A.
- PCX File Format Summary, from the Encyclopedia of Graphics File Formats (includes information about DCX)
- DCA/Intel Communicating Applications Specification (page 54)
- http://cd.textfiles.com/bhawk1197/FAX/FAX_N523.ZIP → SAMPLE.DCX
- input.dcx (PerlMagick test file)