The PDF in question uses a new Transparency mechanism in PDF that creates a shadow effect between transparency groups. The effect falls under Soft Masks and we currently don't support the effect and thus only a slightly transparent black box is drawn over the images in question. We have quite a few samples now and should probably give the effect a shot.

Completely wrong on the potential cause of this issue. It turns out that the images in question uses non normal decode parameter. When interpreted correctly it defines the domain in which a colour component lives. When I add some test code to compensate for this the images are displayed correctly. Still needs bit of work but pretty sure I'm on the right track.

Cleaned update decode processing code for alterRasterYCCK2BGRA(...). I would like to have also added this code for the alterRaster methods but I don't have samples for these cases as of yet. Now that the basic algorithm is setup it should be pretty easy to apply as test cases become available. Marking issue as resolved.