The overprint tests are something that will only work on devices that support Overprint (or Overprint simulation, in the case of Adobe Acrobat/Reader) - this is beyond the normal "color management" work. I would work on color management WITHOUT transparency first - it's much simpler. Once you have that working, then you can work on how CM integrates with the PDF transparency model (of which Poppler only does about 1%). Leonard <div class="gmail_quote">On Wed, May 13, 2009 at 2:28 PM, Hal V. Engel <<a href="mailto:hvengel@astound.net">hvengel@astound.net</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Now that it looks like the color management support will be released with version 0.12 I decided to do some more testing. I did this testing using a patched version of the Qt4 demo viewer (the same patch set I sent to the email list on Monday) using the altona pdf test suite <a href="http://www.eci.org/doku.php?id=en:downloads" target="_blank">http://www.eci.org/doku.php?id=en:downloads</a>. This test suite has tests for many things but I was only interested in those that were related to color rendering. The most significant issues are with the following test elements: #26 "Duotone and Spot Color" Poppler fails the spot color test but appears to work for the doutone test. #27 "Overprinting spot color and process color black" Only the overprinted color is displayed. #28 "Overprinting process colors only" Only the overprinted color is displayed. #34 through #38 These are renderings involving different source color spaces and/or different rendering intents. Currently the color management code in poppler does not handle rendering intents and this shows up in tests #35 through #38. But it also appears that CM is not functioning at all for vector elements (test #34). The altone test suite appears to be comprehensive and is a harsh test of any PDF rendering engine but it should help to find and correct rendering issues since each test element only tests a specific well documented feature. Not all of the above issues are specifically color management problems. #34 through #38 are definitely color management issues and #26 (spot color) may also be a color management issue. #27 and #28 may be transparency issues but may also be impacted by color management. I think one goal for v 0.12 should be for poppler to be able to pass all (or maybe most) of the above tests. Hal PS: Does anyone have a time frame for when my patches or derivatives of those patches will be applied to git? _______________________________________________ poppler mailing list <a href="mailto:poppler@lists.freedesktop.org">poppler@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/poppler" target="_blank">http://lists.freedesktop.org/mailman/listinfo/poppler</a> </blockquote></div>