ITU-T Recommendations

This Recommendation specifies the technical features of Mixed Raster Content (MRC) imaging format that enables efficient processing, interchange and archiving of raster-oriented pages containing a mixture of multi-level and bi-level images. This efficiency is realized through segmentation of the image into multiple layers (planes), as determined by image type, and applying image specific encoding, spatial and colour resolution processing.A rasterized page may contain one or more image types, such as: multi-level continuous-tone or palletized colours (contone) usually associated with naturally occurring images; bi-level detail associated with text and line-art; multi-level colours associated with the text and line-art. This Recommendation makes provisions for processing, interchange, and archiving of these image types in multiple separate layers. Recombining the layers in a prescribed manner regenerates the original image.This edition of T.44 integrates Amendment 1 (which added a new Annex B which defines provisions for sharing resources across pages, stripes and layers and provisions for using colour tags as a means of representing text colour, that play an essential role in the application of JBIG2 of ITU-T Rec. T.88) with a number of additional modifications to the main body and its annexes that give the definition of the necessary technical specifications to support YCC colour space (as described in ITU-T Rec. T.42). This will allow the YCC colour space to be deployed using almost the same method as that of the LAB colour space.