Thu, 25 Jun 2009 07:21:16 -0700 Josh Andler <scislac@...400...> kirjoitti:
I can see the bug tracker post-release now, "Filters in inkscape are buggy/broken", and a bunch more like it. If people need to manually modify a file to get other renderers to create the same output (or to get our output to match others), it's fundamentally broken as far as the users are concerned (myself included).
Not only is this something that we want to get corrected for our users, but this is one of those project reputation issues. It will be well over a year since our last release and one of our key new features is "broken" compatibility-wise with other SVG renderers/editors... and yet we're still on track to knowingly release with it?
As Bulia Byak just noted, Inkscape generates filters with color-interpolation-filters="sRGB" so no need to edit manually the files generated with 0.47.
An also, I don't want to belittle the problem, but this "key new feature" has been like this since 0.45 and it wasn't until lately that the problem was spotted. For real color-interpolation-filters support, I believe there exists a simple solution and a high-quality solution.
Simple: when needed, transform the filter input image to linearRGB and the output image back to sRGB. Colour quantization problems likely (read: banding)
High-Quality: make filters use 16 bit colours internally and do the simple solution. Would help with some other quality issues, too. This qould require a fair amount of work, so I'd be wary of pushing such update in this late in release cycle. (or we could create special versions of filters so they do sRGB->linearRGB->sRGB conversion internally -- lots of work and doesn't account for the possibility of linearRGB input images)