On Sun, 2015-04-19 at 01:26 +0200, renat wrote:
> > scanned images are going pixelated
> Faced the very same (or similar?) problem while trying to resize
> photos made by
> digital camera. Very similar "grids" appear on nearly-flat surfaces
> with a bit
> of noise (like on sky). Surprisingly, faced the very same grids not
> only in
> GIMP, but in some other programs as well (in Image Viewer in Ubuntu
> 14.04, for
> example), so there may be a problem with underlying library (GTK?),
> not with
> GIMP itself.
> Here is an full-size example image:
> And it's resize (width 1920 px) - grid is easily visible:
Yes, there;s a Moiré pattern in the resized image.
How was the image created exactly? It looks like you photographed a
printed image and then used rawtherapee to convert to a jpeg for gimp
to open?? If so, the low frequency grid is from the four-colour print
I see this pattern in gimp scaling with linear but not with cubic --
see Tool Options.
> Tests were performend with gimp 2.8.10-0ubuntu1 on Ubuntu 14.04, and
> with gimp
> 2.8.14 on Windows 7 Home.
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