ConTeXt support for DjVu backend

ConTeXt support for DjVu backend

[Kip Warner]

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Hey list,

Are there any plans to eventually support the DjVu format as an
additional backend alternative to PDF? DjVu is a free standard promoted
as an alternative to PDF. It is allegedly a superior format.

<https://secure.wikimedia.org/wikipedia/en/wiki/DjVu>

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com

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Re: ConTeXt support for DjVu backend

[Hans Hagen]

On 22-6-2011 9:44, Kip Warner wrote:
> Hey list,
>
> Are there any plans to eventually support the DjVu format as an
> additional backend alternative to PDF? DjVu is a free standard promoted
> as an alternative to PDF. It is allegedly a superior format.
>
> <https://secure.wikimedia.org/wikipedia/en/wiki/DjVu>

it's mostly an image format (efficient storage of scanned documents) and 
in that sense it's an alternative (jbig2 is another candidate)

Hans


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Re: ConTeXt support for DjVu backend

[Pontus Lurcock]

On Wed 22 Jun 2011, Kip Warner wrote:

> Are there any plans to eventually support the DjVu format as an
> additional backend alternative to PDF? DjVu is a free standard promoted
> as an alternative to PDF. It is allegedly a superior format.

There's always http://code.google.com/p/pdf2djvu/ in lieu of a direct
backend...

Pont
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Re: ConTeXt support for DjVu backend

[Kip Warner]

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On Wed, 2011-06-22 at 21:51 +0200, Hans Hagen wrote:
> it's mostly an image format (efficient storage of scanned documents) and 
> in that sense it's an alternative (jbig2 is another candidate)
> 
> Hans

That's what I was thinking too at first, that's it's mostly for scanned
documents. But since it is trying to be a replacement for PDF and it has
most of the same features, I think it's more than just that now.

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com

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Re: ConTeXt support for DjVu backend

[Hans Hagen]

On 22-6-2011 10:32, Kip Warner wrote:
> On Wed, 2011-06-22 at 21:51 +0200, Hans Hagen wrote:
>> it's mostly an image format (efficient storage of scanned documents) and
>> in that sense it's an alternative (jbig2 is another candidate)
>>
>> Hans
>
> That's what I was thinking too at first, that's it's mostly for scanned
> documents. But since it is trying to be a replacement for PDF and it has
> most of the same features, I think it's more than just that now.

- the starting point is scanned images
- there can be an ocr layer but still the image is the core
- pdf is more: colorspaces, vector graphics, annotations, etc

So, a djvu document would be less sophisticated. It might not matter for 
many cases, and one could probably make a backend to produce something 
reasonable but it's not worth the trouble I fear. As mentioned, it's 
probably easier to convert the pdf into a djvu with a postprocessor.

Hans

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                                           Hans Hagen | PRAGMA ADE
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                                              | www.pragma-pod.nl
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Re: ConTeXt support for DjVu backend

[Kip Warner]

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On Wed, 2011-06-22 at 23:27 +0200, Hans Hagen wrote:
> - the starting point is scanned images
> - there can be an ocr layer but still the image is the core
> - pdf is more: colorspaces, vector graphics, annotations, etc
> 
> So, a djvu document would be less sophisticated. It might not matter for 
> many cases, and one could probably make a backend to produce something 
> reasonable but it's not worth the trouble I fear. As mentioned, it's 
> probably easier to convert the pdf into a djvu with a postprocessor.
> 
> Hans

Understood. Thanks.

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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Re: ConTeXt support for DjVu backend

[Hans Hagen]

On 22-6-2011 11:31, Kip Warner wrote:
> On Wed, 2011-06-22 at 23:27 +0200, Hans Hagen wrote:
>> - the starting point is scanned images
>> - there can be an ocr layer but still the image is the core
>> - pdf is more: colorspaces, vector graphics, annotations, etc
>>
>> So, a djvu document would be less sophisticated. It might not matter for
>> many cases, and one could probably make a backend to produce something
>> reasonable but it's not worth the trouble I fear. As mentioned, it's
>> probably easier to convert the pdf into a djvu with a postprocessor.
>>
>> Hans
>
> Understood. Thanks.

btw, it would be interesting to have a good open source jbig2 producer 
(as that is natively supported in pdf) and it's a pretty efficient 
compression (close to djvu)

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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                                              | www.pragma-pod.nl
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Re: ConTeXt support for DjVu backend

[Kip Warner]

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On Wed, 2011-06-22 at 23:36 +0200, Hans Hagen wrote:
> btw, it would be interesting to have a good open source jbig2
> producer 
> (as that is natively supported in pdf) and it's a pretty efficient 
> compression (close to djvu) 

Interesting.

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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Re: ConTeXt support for DjVu backend

[Pontus Lurcock]

On Wed 22 Jun 2011, Hans Hagen wrote:

> btw, it would be interesting to have a good open source jbig2
> producer

I believe https://github.com/agl/jbig2enc is open source, but I don't
know whether it fulfils your other criterion of being good.

Pont
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Re: ConTeXt support for DjVu backend

[Hans Hagen]

On 23-6-2011 12:05, Pontus Lurcock wrote:
> On Wed 22 Jun 2011, Hans Hagen wrote:
>
>> btw, it would be interesting to have a good open source jbig2
>> producer
>
> I believe https://github.com/agl/jbig2enc is open source, but I don't
> know whether it fulfils your other criterion of being good.

aha, so someone picked up that thread (years ago, when Hartmut and I 
looked into it it was rather messy to compile it due to depedencies)

looks like a challenge for Luigi (nice topic for context conference too)

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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                                              | www.pragma-pod.nl
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