The attached program (in eps-version-bug.zip) renders a 40x40 black square in an EPS file, setting the paper size to 50x50. The resulting file should therefore render as a black box with a 5 pixel white border when opened in a preview application. However, the first line of the exported EPS file is

%!PS-Adobe-1.0 EPSF-3.0

and the "PS-Adobe-1.0" part of this prevents previewers, notably Mac OS X Preview, from rendering the file with the correct bounding box.

Since Qt's PostScript support embeds graphics, fonts and so on, I think this is simply wrong and should read

%!PS-Adobe-3.0 EPSF-3.0

to use the more modern standard. This is hard coded in QPSPrintEnginePrivate::emitHeader in the qprintengine_ps.cpp file - see attached patch.