On Sat, 06 Sep 2008 00:22:58 +0200, Sven Neumann [EMAIL PROTECTED] wrote:
Hi,
while I see your points and I appreciate your comparisons of the
results, fact is that the current code has bugs that are fixed by my
patch. The most apparent problem is that the current code is using the
Hi,
On Mon, 2008-09-08 at 10:04 +0200, [EMAIL PROTECTED] wrote:
Clearly trapping the special case of only scaling in one dimension is a
worthwhile optimisation. That would seem to be a separate issue from
fundementally changing the scaling algo. Could I suggest you break these
two
Hi,
while I see your points and I appreciate your comparisons of the
results, fact is that the current code has bugs that are fixed by my
patch. The most apparent problem is that the current code is using the
2-dimensional decimation routines even when downscaling only in one
direction. To see
Hello Sven:
... To see this, create a new image, apply a standard grid on it
using Filter-Render-Patterns-Grid and scale it down in one direction
by a scale factor smaller than 0.5. The one pixel wide grid lines will
become blurry. I don't think this is acceptable and so far the only
choice
On Sat, 30 Aug 2008 19:35:20 +0200, Alastair M. Robinson
[EMAIL PROTECTED] wrote:
Comparing Lanczos 3% old vs patched: lefthand building roof has bad
moire effects that totally obscure underlying detail. Both sets of
trees have much less obvious staircasing in the current code. There
On Fri, 29 Aug 2008 21:33:45 +0200, Sven Neumann [EMAIL PROTECTED] wrote:
Hi,
On Fri, 2008-08-29 at 14:15 +0200, Sven Neumann wrote:
I also started to play with some enhancements on top of the patch we are
discussing here. Using a steep gaussian filter instead of the plain box
filter seems
Hi :)
Geert Jordaens wrote:
The code is not interpolating rather resampling (supersampling in case
of lanczos and bicubic) in the case of scaling down.
OK - perhaps I'm misunderstanding the approach taken here, then.
As with interpolation, the Lanczos/Bicubic functions are being used to
Hi :)
[EMAIL PROTECTED] wrote:
Comparing Lanczos 3% old vs patched: lefthand building roof has bad moire
effects that totally obscure underlying detail. Both sets of trees have
much less obvious staircasing in the current code. There is an overall
impression of sharpness in the new
Hi,
On Thu, 2008-08-28 at 22:38 +0200, Geert Jordaens wrote:
What are your doubts with the new code? Why would a simple box-filter be
better for decimating?
My doubts with the current approach are manifold:
The current code has decimation routines, but they are only suited for
the
Hi,
I also started to play with some enhancements on top of the patch we are
discussing here. Using a steep gaussian filter instead of the plain box
filter seems to be a good compromise. It's better at suppressing Moire
patterns, at the cost of introducing a little blur. I have not yet
finished
Hi
Sven Neumann wrote:
As already explained in my previous mail, the decimation routines are
only used for the pre-scaling steps. As soon as the image is close
enough to the final size, the chosen interpolation routine is used. This
gives continuous results for all scale factors as there is
Alastair M. Robinson wrote:
Hi
Sven Neumann wrote:
As already explained in my previous mail, the decimation routines are
only used for the pre-scaling steps. As soon as the image is close
enough to the final size, the chosen interpolation routine is used. This
gives continuous results
Sven Neumann wrote:
Hi,
On Thu, 2008-08-28 at 22:38 +0200, Geert Jordaens wrote:
What are your doubts with the new code? Why would a simple box-filter be
better for decimating?
My doubts with the current approach are manifold:
The current code has decimation routines, but
Hi,
On Fri, 2008-08-29 at 14:15 +0200, Sven Neumann wrote:
I also started to play with some enhancements on top of the patch we are
discussing here. Using a steep gaussian filter instead of the plain box
filter seems to be a good compromise. It's better at suppressing Moire
patterns, at the
Sven Neumann wrote:
Hi,
after spending quite some time with the new scale code, I have some
doubts about the way that it is scaling down. So here's a patch that I
am playing with at the moment:
http://sven.gimp.org/misc/gimp-decimate.diff
This patch applies against SVN trunk. It only
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