DCX

DCX is an image file format based on PCX. It supports multiple images in a single file, and may be used for fax images.

Format
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).

Identification
Files begin with signature bytes.

Specifications

 * , from the Encyclopedia of Graphics File Formats (includes information about DCX)
 * DCA/Intel Communicating Applications Specification (page 54)

Software

 * ImageMagick
 * Konvertor
 * XnView
 * abydos

Sample files

 * http://cd.textfiles.com/bhawk1197/FAX/FAX_N523.ZIP → SAMPLE.DCX
 * input.dcx (PerlMagick test file)
 * https://telparia.com/fileFormatSamples/image/dcx/