djvu image file format in emacs?

djvu image file format in emacs?

[joakim]

I would like to add the .djvu image file format to Emacs list of
supported native formats.  image-dired already almost supports it
through ImageMagick.

Does anyone have any opinions on this? I like djvu as an archive format
for scanned books, since its free, supported by free software, and
compresses well, as far as I can determine.

-- 
Joakim Verona

Re: djvu image file format in emacs?

[Stefan Monnier]

> I would like to add the .djvu image file format to Emacs list of
> supported native formats.  image-dired already almost supports it
> through ImageMagick.
> Does anyone have any opinions on this?

Sounds good.  BTW, this will make it that much more desirable to merge
image-mode and doc-view.el.


        Stefan

Re: djvu image file format in emacs?

[joakim]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> I would like to add the .djvu image file format to Emacs list of
>> supported native formats.  image-dired already almost supports it
>> through ImageMagick.
>> Does anyone have any opinions on this?
>
> Sounds good.  BTW, this will make it that much more desirable to merge
> image-mode and doc-view.el.

Please clarify.

>
>         Stefan
>
-- 
Joakim Verona

Re: djvu image file format in emacs?

[Stefan Monnier]

>>> I would like to add the .djvu image file format to Emacs list of
>>> supported native formats.  image-dired already almost supports it
>>> through ImageMagick.
>>> Does anyone have any opinions on this?
>> Sounds good.  BTW, this will make it that much more desirable to merge
>> image-mode and doc-view.el.
> Please clarify.

image-mode allows you to view a single file which contains one or more
images.
doc-view allows you to view a directory which contains (one or more)
images (tho it also additionally creates the directory first, from
a PDF/PS/DVI file).
If you look at the two modes and their code, you'll see there's already
some overlap, but there should be more.


        Stefan

Re: djvu image file format in emacs?

[joakim]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>>> I would like to add the .djvu image file format to Emacs list of
>>>> supported native formats.  image-dired already almost supports it
>>>> through ImageMagick.
>>>> Does anyone have any opinions on this?
>>> Sounds good.  BTW, this will make it that much more desirable to merge
>>> image-mode and doc-view.el.
>> Please clarify.
>
> image-mode allows you to view a single file which contains one or more
> images.
> doc-view allows you to view a directory which contains (one or more)
> images (tho it also additionally creates the directory first, from
> a PDF/PS/DVI file).
> If you look at the two modes and their code, you'll see there's already
> some overlap, but there should be more.

Interesting.

Another question:
I would like to use the ImageMagick MagickWand api to support djvu,
because then I could, as it seems, be easy to do other image operations in Emacs
I'd like to do, scaling, croping, etc.

Any opinions on this? ImageMagick is free software, has GPL compatible
license, and seems nice. image-dired already relies on ImageMagick.

>
>
>         Stefan
-- 
Joakim Verona

Re: djvu image file format in emacs?

[Tassilo Horn]

joakim@verona.se writes:

Hi Joakim,

> Another question:
> I would like to use the ImageMagick MagickWand api to support djvu,
> because then I could, as it seems, be easy to do other image
> operations in Emacs I'd like to do, scaling, croping, etc.
>
> Any opinions on this? ImageMagick is free software, has GPL compatible
> license, and seems nice. image-dired already relies on ImageMagick.

AFAIK, SXEmacs uses libWand only for all image stuff and dropped the
image format specific code.  Maybe that's a good approach, but of course
then you need to have ImageMagick then to get any image support...

Bye,
Tassilo

Re: djvu image file format in emacs?

[Miles Bader]

Tassilo Horn <tassilo@member.fsf.org> writes:
> AFAIK, SXEmacs uses libWand only for all image stuff and dropped the
> image format specific code.  Maybe that's a good approach, but of course
> then you need to have ImageMagick then to get any image support...

In theory, though all the multi-purpose image libraries I've looked at
have been pretty crappy, so my tendency is to be skeptical (dunno about
libmagicwand in particular, tho imagemagick generally seems to tend in
the "giant bloated mess" direction).

If there's something out there which really is smallish, very portable,
and very flexible, it might be a good thing to look into.

I'm not sure how much of Emacs image code could be gotten rid of though
-- much of the image code in emacs is actually for supporting
emacs-specific features, not the basic loading/saving.

-Miles

-- 
I'd rather be consing.

Re: djvu image file format in emacs?

[joakim]

Miles Bader <miles@gnu.org> writes:

> Tassilo Horn <tassilo@member.fsf.org> writes:
>> AFAIK, SXEmacs uses libWand only for all image stuff and dropped the
>> image format specific code.  Maybe that's a good approach, but of course
>> then you need to have ImageMagick then to get any image support...
>
> In theory, though all the multi-purpose image libraries I've looked at
> have been pretty crappy, so my tendency is to be skeptical (dunno about
> libmagicwand in particular, tho imagemagick generally seems to tend in
> the "giant bloated mess" direction).
>
> If there's something out there which really is smallish, very portable,
> and very flexible, it might be a good thing to look into.

I have never seen an image library like this.

> I'm not sure how much of Emacs image code could be gotten rid of though
> -- much of the image code in emacs is actually for supporting
> emacs-specific features, not the basic loading/saving.

I wont attempt to replace existing Emacs image code. I think it is good
to have basic image support withouth ImageMagick.

I will attempt to use ImageMagick to load djvu files in Emacs.  Since
ImageMagick can lots of other image formats, they will also be loadable
with Imagemagick. If ImageMagick is not linked, the existing image code
will execute as normal.

>
> -Miles
-- 
Joakim Verona