6327 2008-12-20 16:46:42 +0000 filters-comptran-01-b reference PNG incorrect 2010-10-18 17:16:40 +0000 1 1 1 Unclassified SVG Filter Effects All Specifications PC Windows NT NEW P2 normal Test Suite 1 th.v.d.gronde schepers krit www-svg oldest_to_newest 22816 0 th.v.d.gronde 2008-12-20 16:46:42 +0000 Attached is a file which demonstrates how the first three gradients should render (if I read the SVG standard correctly) by simply substituting the filtered gradients by gradients which mimic the filtering. I have no idea in what way, exactly, the current reference PNG is wrong, but it most definitely seems to be very wrong: - The first third of the "table" gradient should be a transition from yellow to black, without any green. This can be easily verified by considering that in the original gradient went from #ff0000 to #00ff00 and that the two transfer functions are mirror versions of each other. - At the far left of the "linear" gradient the red channel in the reference PNG reaches values above 200, while 255*(.5+.25)=191.25. - At x=133, the original gradient (at the top) has green value 207, the "gamma" gradient should therefore have value 255*(2*(207/255)^3+0)=272.8... (so 255, as the values are clamped). In contrast, the reference PNG has value 185. 22817 1 612 th.v.d.gronde 2008-12-20 16:48:43 +0000 Created attachment 612 SVG file that demonstrates how filters-comptrans SHOULD render (except for the gamma gradient, which is not as easy to mimic) 22946 2 th.v.d.gronde 2009-01-06 13:15:58 +0000 I just found out about the color-interpolation properties, which means the calculations become a lot more complicated (and it's not as easy to calculate a correct reference). So, the original reference MIGHT be correct after all. 41494 3 krit 2010-10-18 17:16:40 +0000 (In reply to comment #2) > I just found out about the color-interpolation properties, which means the > calculations become a lot more complicated (and it's not as easy to calculate a > correct reference). So, the original reference MIGHT be correct after all. Thats correct. The 'color-interpolation-filters' property is set to 'linearRGB' by default. Thats why your expected result looks different to the one on the test suite. You get your result, if you set 'color-interpolation-filters' to 'sRGB'. At least on viewers with support for this property. I think this bug can be closed. 612 2008-12-20 16:48:43 +0000 2008-12-20 16:48:43 +0000 SVG file that demonstrates how filters-comptrans SHOULD render (except for the gamma gradient, which is not as easy to mimic) filters-comptran-01-b-patch.svg image/svg+xml 4723 th.v.d.gronde PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCjwhRE9DVFlQRSBzdmcgUFVC TElDICItLy9XM0MvL0RURCBTVkcgMS4xIEJhc2ljLy9FTiIgImh0dHA6Ly93d3cudzMub3JnL0dy YXBoaWNzL1NWRy8xLjEvRFREL3N2ZzExLWJhc2ljLmR0ZCI+DQo8IS0tPT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PS0t Pg0KPCEtLT0gIENvcHlyaWdodCAyMDAwIFdvcmxkIFdpZGUgV2ViIENvbnNvcnRpdW0sIChNYXNz YWNodXNldHRzICAgICAgICAgID0tLT4NCjwhLS09ICBJbnN0aXR1dGUgb2YgVGVjaG5vbG9neSwg SW5zdGl0dXQgTmF0aW9uYWwgZGUgUmVjaGVyY2hlIGVuICAgICAgICA9LS0+DQo8IS0tPSAgSW5m b3JtYXRpcXVlIGV0IGVuIEF1dG9tYXRpcXVlLCBLZWlvIFVuaXZlcnNpdHkpLiBBbGwgUmlnaHRz ICAgICAgPS0tPg0KPCEtLT0gIFJlc2VydmVkLiBTZWUgaHR0cDovL3d3dy53My5vcmcvQ29uc29y 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