Hi, On Tue, Jun 5, 2012 at 11:33 AM, Jan Holesovsky <ke...@suse.cz> wrote: > Great stuff - I have pushed your patch, and also my patches to default > to Lanczos filter. Can you please add an example of "before" and > "after" where the advantages of the Lanzcos filter are nicely visible to > the Release Notes (http://wiki.documentfoundation.org/ReleaseNotes/3.6)? Done.
> Adding the QA list to the CC: - thanks to Tomaz, we have changed the > default of the image resize operations to a new scaling operation. > Please be careful about bugs that involve scaling of images, quality of > eg. PDF output, or speed of such operations. Regarding bugs.. I have found a problem with creation of Bitmaps in ImplScaleLanczos. I have fixed so the Bitmaps are created in the same way as in ImplScaleInterpolate - the patch is attached. This problem is visible if you go into impress and set the background of a slide to a bitmap which is tiled. I have not found any reports in bugzilla about this yet. > Tomaz - what interests you next? :-) You've already outlined some ideas > regarding the filters, correct? I am working now to on blur/soften filter which uses ImplHorizontalConvolution and ImplVerticalConvolution - which are also used in Lanczos resampling. I have this already working with a parameterized blur radius. Currently the soften filter only uses a fixed 3x3 convolution matrix with 2D convolution algorithm. My solution should be faster and more flexible than the current one. I still need to add a dialog to select the blur radius which I will do in step 2. Other ideas I have is to add "reduce image resolution" function directly to bitmap so a user could change the image resolution not only in PDF export but in general. When a user applies a filter, the image is changed and saved as a new PNG image into the document. So to create something like this should not be hard. In a long run I want to improve the quality of images in export but I think this is a problem of whole page rendering and not so simple to solve. Regards, Tomaž
0001-Fix-new-Bitmap-creation-in-Lanczos-resampling.patch
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