Created attachment 80840 [details]
PDF Test case
The background image is rendered grey-ish whearas in Acroread is rendered blue-ish.
FWIW, although the description is similar, this is not the case of https://bugs.freedesktop.org/show_bug.cgi?id=59179
Tested with poppler-glib-demo from master (>0.22.4)
Nothing to do with the glib frontend.
Fixed in actual version