<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Poppler can't display transparent JPEG 2000 images" href="https://bugs.freedesktop.org/show_bug.cgi?id=93468#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Poppler can't display transparent JPEG 2000 images" href="https://bugs.freedesktop.org/show_bug.cgi?id=93468">bug 93468</a> from <a class="email" href="mailto:Thomas.Freitag@alfa.de" title="Thomas Freitag <Thomas.Freitag@alfa.de>"> Thomas Freitag</a> <pre>Mmmh, Tristan, image 2 and 3 contain an alpha channel and are therefore not handled correctly by poppler. BUT: where in case of image 1 an image object and a corresponding smask is set in the PDF and so the transparency remains, the parameter SMaskInData is not set for image 2 and 3. The PDF spec says that in this case the alpha channel in the jpx encoded data should be ignored (Default: SMaskInData = 0). So these images will remain non-transparent and look like image 5. I will upload a patch that handles SMaskInData = 0 correctly but still will not display correctly if SMaskInData is 1 or 2. This would mean more effort also in the output devices to handle that correctly, so I will not implement that before I get some good examples.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>