I olso get the top+left pixel error but only when scaling using a script-fu. Any idea?

----- Oorspronkelijk bericht ----- Van: David Gowers [mailto:00ai99@gmail.com] Verzonden: woensdag, juli 30, 2008 03:53 PM Aan: 'Geert Jordaens'
CC: Gimp-developer@lists.xcf.berkeley.edu Onderwerp: Re: [Gimp-developer] need help with bug #464466 (downscaling quality)

Hi,

On Wed, Jul 30, 2008 at 10:23 PM, David Gowers wrote:

The webpages are nearly finished, I'm checking them now.

Some observations on the results of scaling:

* The old code mistreated the left and top edges, resulting in a duplication of up to 1 pixel on the left and top edge (and corresponding omittal of a row of pixels on the right and bottom edge). This looked slightly odd for upscaling, and very odd for downscaling. The new code gives results that are more predictable and more correct.

* There is still a bug present in the new lanczos code which you can easily see on the horse test image- the top row and left column of pixels acquire junk pixels (there was only pure white in the source image near there) . An example of the bug is attached. I hope this helps isolate the cause of the bug.
(this bug is not present in the old code)

OOPS! In fact, this bug is a reduced version of the same 'top+left edges stretched' bug in the old code.

I've finished checking, and am just sending off the results and webpage to Sven now.

David