XLD4

XLD4 (maybe also called Q4) is a raster graphics format that was used mainly in Japan. An image consists of two files: a .q4 file, and a .q4d file.

Identification
Q4 files have ASCII "" at offset 11.

Q4D files begin with the ASCII "===============>>>>> XLD4 GRAPHIC DATA DOCUMENT <<<<<===============" and are in character encoding IBM-932/IBM-943

Software

 * RECOIL
 * q4toppm

Sample files

 * XLD4_images.zip
 * https://telparia.com/fileFormatSamples/image/q4/
 * https://telparia.com/fileFormatSamples/text/q4d/

Links

 * https://sourceforge.net/p/recoil/bugs/14/