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Re: Image rescaling

From: joakim
Subject: Re: Image rescaling
Date: Mon, 15 Sep 2014 14:55:50 +0200
User-agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/24.4.50 (gnu/linux)

Lars Magne Ingebrigtsen <address@hidden> writes:

> Most of the image format decoders (jpeg and gif, for instance) do not
> support image rescaling.  So shr uses ImageMagick for all its image
> handling.
> There are two problems with this:
> 1) ImageMagick is crashy.  Virtually all Emacs crashes I get happen deep
> in the ImageMagic code.  I mean, I don't get a lot of crashes, but they
> happen from time to time, and are pretty annoying.
> 2) Some people run Emacs without ImageMagick built in, but usually have
> the other libraries enabled.
> So I would propose to add a general image scaling function, and use that
> in all the image handling functions.  Without image rescaling, Emacs is
> pretty useless for anything that involves handling images.
> Does this sound OK to everybody?
> And if so, is there an FSF-copyright-assigned quality image rescaling
> function out there that I could adapt to Emacs so that I don't have to
> write it myself?  >"?

Its a pity ImageMagic is crashy, but I take your word for it, since i
dont experience it myself.

Maybe something can be extracted from Gimp or Inkscape?
Other than that, implementing a schoolbook image rescaling algorithm
shouldnt be too much work.

Joakim Verona

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