SBIG CCDOPS image
SBIG CCDOPS image is a raster image file format produced by the CCDOPS software associated with SBIG CCD astronomical cameras. SBIG stands for Santa Barbara Instrument Group.
Images are 16-bit grayscale, and use a custom compression scheme based on delta encoding.
[Ed. note: This article needs expansion, to explain different versions, and file extensions like .st4, .st7, .stx...]