[poppler] rotated/downsampled images
Thomas.Freitag at kabelmail.de
Sat Jul 28 00:57:57 PDT 2012
Am 28.07.2012 09:47, schrieb William Bader:
> If there is an issue of speed (for viewing on the screen) vs. accuracy
> (for making a high quality eps), maybe it could be a command line option.
I agree, William. That was also at the back of my mind. But let us have
a reliable better algorithm first. I often see ideas here on the list
but often also without any response or results later :-(
> > Date: Sat, 28 Jul 2012 09:33:38 +0200
> > From: Thomas.Freitag at kabelmail.de
> > To: abansal at linkedin.com; billhatesspam at yahoo.com
> > CC: poppler at lists.freedesktop.org
> > Subject: [poppler] rotated/downsampled images
> > Hi Arpit & Bill!
> > In a quite short period You both offer to implement a better algorithm
> > for rotated / scaled images than the Bresenham algorithm, one of You
> > wants to implement the bilinear, the other the bicubic interpolation.
> > Would be funny to see, which one is the better compromise between speed
> > and quality.
> > In splash always the scaling of an image is done first with
> > Splash::scaleImage, and then the scaled image will be rotated in i.e.
> > Splash::arbitraryTransformImage. So this is the place where You can
> > implement a new algorithm.
> > I know, that we get sometimes a poor quality for slightly rotated
> > images, see i.e the wheels in
> > http://www.it.piaggio.com/media/mp3hybdepita.pdf on the first page, and
> > therfore it would be nice to have a better algorithm. But we must keep
> > the speed in mind, because poppler is often used to display a PDF in
> > time under unix. If You need any assistance, i.e. proof Your new
> > implemented code with a lot of PDF, I'm willing to support You.
> > Cheers,
> > Thomas
> > _______________________________________________
> > poppler mailing list
> > poppler at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/poppler
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