Mixed Raster Content
Mixed Raster Content (MRC, or T.44) is a compressed graphics format. It's most often found wrapped up within a container format such as TIFF-FX as a method of compressing image data. It segments the image into different parts to which different compression methods can be used most efficiently. It is standardized by the ITU as T.44 and by ISO as ISO/IEC 16485:2000.
Structurally, the format is based on JPEG's system of markers and segments, primarily using "APP13" segments.
MRC data begins with bytes
ff d8 ff ed ?? ?? 'M' 'R' 'C'.