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Re: image scaling
From: |
Miles Bader |
Subject: |
Re: image scaling |
Date: |
Thu, 21 Feb 2008 18:10:53 +0900 |
"Mathias Dahl" <address@hidden> writes:
>> I'd like to add such a feature to image-mode.el, but am wondering how we
>> should go about doing it. Would there be some advantage to provide it
>> at the C level (e.g. if some of the image libs we use already provide
>> the necessary functionality) or should we just bite the bullet and call
>> some external tool like "convert -scale ..." (with the disadvantage that
>> flushing the image cache will not automatically cause the image to be
>> re-scaled).
>
> It would be really good to have such a feature as I think it would
> make browsing images in image-dired's thumbnail buffer (display some
> large images there and use SPC and DEL to go back and forth to see
> what I mean) much quicker. At least I guess it would be quicker to do
> this natively inside Emacs than using convert to scale the image as we
> do now.
In addition, I think it's a bit dodgy to rely on specific programs --
"convert", for instance is part of imagemagick, which is a
humongous/bloated package, so I don't have it installed on my home
system (even though it's a GNU/Linux system, where you might otherwise
expect to find it installed). I imagine it's simply not installed at
all on many non-GNU systems, or hard to find even when it is installed.
Scaling images isn't all that hard, even if you try to do a good job
(using a filter to avoid aliasing etc), so I think it would be fine to
do it in C code.
[We could optionally try to use library calls to do it when those
libraries will be linked into Emacs anyway, e.g., gtk-related libs.]
-Miles
--
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