RasterView is a simple GUI image viewer which specializes in displaying CUPS raster and PWG Raster files.
The CUPS and PWG Raster formats are used by CUPS in some printing workflows. Both can handle multi-page image files, and can embed job specific settings in page headers (such as page size or duplex settings).
PWG Raster was specified by the Printer Working Group working on the upcoming "IPP Everywhere" standard which aims at ubiquituos "driverless printing" for all major OS platforms. It is one of the three core formats (besides JPEG and PDF) to be supported by print devices for compliance with the IPP Everywhere standard.
A viewer for the generated raster files in such a printing workflow is important not just for debugging print problems...
RasterView has a dependency on FLTK. It was written by Mike Sweet (CUPS developer). Its license is GPL v2. Its latest release is v1.4.1 (Aug 27, 2015).
I was able to compile it on Debian Jessie "out of the box".