Re: [Gimp-developer] improving bicubic interpolation

2007-01-29 Thread Michael Schumacher
Von: Sven Neumann [EMAIL PROTECTED] On Sun, 2007-01-28 at 22:04 +0100, [EMAIL PROTECTED] wrote: http://bugzilla.gnome.org/show_bug.cgi?id=363775 Sorry, but I am unable to follow your way of handling bug reports. If there's now a new bug that deals with remaining issues in bug #167956,

Re: [Gimp-developer] improving bicubic interpolation

2007-01-28 Thread Sven Neumann
Hi, before you start attacking the bicubic interpolation routines, could you please have a look at the outstanding bug report for Lanczos: http://bugzilla.gnome.org/show_bug.cgi?id=167956 Would be nice to get this one closed finally. And we can't release 2.4 as long as it is still open.

Re: [Gimp-developer] improving bicubic interpolation

2007-01-28 Thread Sven Neumann
Hi, On Sun, 2007-01-28 at 22:04 +0100, [EMAIL PROTECTED] wrote: In fact that's exactly what I am working on. If you look at my last post to the bug you linked above you will see I started a new bug since this one was getting too long, confused and mixing a number of issues.

Re: [Gimp-developer] improving bicubic interpolation

2007-01-25 Thread William Skaggs
Gg, Google Scholar only finds one paper by RG Keys on this topic: Cubic Convolution Interpolation for Digital Image Processing RG KEYS IEEE TRANSACTIONS ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, VOL. ASSP-29, NO. 6, DECEMBER 1981 I was able to download a pdf of that paper using my

Re: [Gimp-developer] improving bicubic interpolation

2007-01-25 Thread Mukund
Hi Sven and gg, Sven Neumann wrote: Hi, On Mon, 2007-01-22 at 10:13 +0100, [EMAIL PROTECTED] wrote: All references to Keys' work seem to lead to papers published by IEEE and available on a per article subscription. I assume the charge for one or two articles would be fairly nominal.

Re: [Gimp-developer] improving bicubic interpolation

2007-01-25 Thread gg
Many thanks for the offer. Finally Simon was able to come up with a copy of Keys' paper for me but I will keep your offer in mind since I came accross several references to pdfs on IEEE that may also be useful. Thanks to all for the many positive and helpful replies, and especially to Simon for

[Gimp-developer] improving bicubic interpolation

2007-01-24 Thread gg
In my on-going research to reduce the filter artifacts noted in http://bugzilla.gnome.org/show_bug.cgi?id=166130 , I found many references to a promising improvement on the cubic convolution kernel approach I have been using. As noted in the bug report using a convolution kernel entirely

Re: [Gimp-developer] improving bicubic interpolation

2007-01-24 Thread Sven Neumann
Hi, On Mon, 2007-01-22 at 10:13 +0100, [EMAIL PROTECTED] wrote: All references to Keys' work seem to lead to papers published by IEEE and available on a per article subscription. I assume the charge for one or two articles would be fairly nominal. Would this be a good use of some of