Re: gm convert bla.jpg bla.pdf multiplies SEVENFOLD the file's size !

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On Sun, 9 Dec 2018, Mehdi wrote:

> I don't exactly, but that's for GM:
>
>> GraphicsMagick 1.3.31 2018-11-17 Q16 http://www.GraphicsMagick.org/
>> Copyright (C) 2002-2018 GraphicsMagick Group.
>> Additional copyrights and licenses apply to this software.
>> See http://www.GraphicsMagick.org/www/Copyright.html for details.
>> Feature Support:
>>   Native Thread Safe       yes
>>   Large Files (> 32 bit)   yes
>>   Large Memory (> 32 bit)  yes

The above is good.

If you were using a Q8 build then you could expect to process twice as 
much before failing because the decoded images take half as much 
memory.

> I guess that means everything is in 64 bits. Ok for "define". Now, I don't
> know if using memory is the problem, since it says "cache":
>
>> convert-im6.q16: unable to extent pixel cache `Succès' @
>> fatal/cache.c/CacheSignalHandler/3626.
>> convert-im6.q16: unable to extent pixel cache `Aucun fichier ou dossier de
>> ce type' @ fatal/cache.c/CacheSignalHandler/3626.
>
> is what it says when trying with 200 Mo big directories. GM for the same
> case, died with "gm convert: abort due to signal 7 (SIGBUS) "Bus Error"...
>              fish: 'gm convert -limit memory 4GB -d…' terminated by signal
> SIGABRT (Abandon)".

I get a somewhat different error out of ImageMagick (even when it is 
given quite a lot of real resources such as memory and disk) and then 
it produces no output at all.  Both GraphicsMagick and ImageMagick 
store their pixels in what they call a "pixel cache" since they are 
based on a similar underlying design.  When they say "cache" they 
mean RAM plus temporary file disk space because the decoded image may 
be stored in either way.

The SIGBUS error from GraphicsMagick is not good.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt
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