OpenRaster is a file format proposed for the common exchange of layered images between raster graphics editors.
"[4] In response to these restrictions, the OpenRaster format was proposed by KDE and Krita developers Boudewijn Rempt[5] and Cyrille Berger[6] at the first Libre Graphics Meeting at Lyon, France in the spring of 2006 and is drawn from the Open Document Format.
A likely work-around is the optional storage of a redundant extra layer containing the fully rendered pixel data as seen after all image processing, or possibly a lower-resolution snapshot of it suitable for previewing and thumbnailing.
Different implementations levels might be defined, like, tiny, simple, small, normal, full and custom.
OpenRaster has limited support in a few graphics programs and among these its cross-application use is not seamless.