Hi, On Wed, 2008-10-29 at 23:52 +0100, Joern P. Meier wrote:
> I don't think the performance is the biggest issue. However, the results > of current (i.e. Gimp 2.6.x) downscaling are. > > In Gimp 2.4 I could use the "Cubic" Option which resulted in a little > blurring, but that could be fixed with a judicious use of the "Sharpen" > filter. So in the end, it yielded a lot of control about the final result. GIMP 2.4 did not implement a "Cubic" option for downscaling. You effectively used "Linear". > The new Gimp 2.6 "Cubic" option usually yields too bad quality to be > considered (I won't even begin with "Linear"). I guess you are running into bug #556248 here (which will be 'fixed' in 2.6.2). The result of that bug is that scaling down by a factor of 0.5 results in no interpolation at all. Even with that fixed, I would still like to see an improvement for the downscaling algorithm in 2.6. If we could have a proper decimation algorithm to replace the current code, I would even consider applying that for a 2.6 release. Hopefully we can switch to GEGL at some point for scaling. As far as I can see there is now a promising upscaling implementation available there. Sven _______________________________________________ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
