[Qgis-community-team] compiling manual & image quality

[MORREALE Jean Roc]

Otto Dassau a écrit :
> Hi Jean Roc,
> 
> On Fri, 21 Aug 2009 11:04:10 +0200
> MORREALE Jean Roc <jr.morreale at enoreth.net> wrote:
> 
>> Hi,
>>
>> I've been compiling the french manual for 1.0 (using texlive2008) but 
>> the quality of the images is very low : the jpg figuring in the final 
>> pdf are full of compression blocks making some captures hard to read.
>>
>> All the source's images have been localized and saved as png (96dpi) so 
>> I would really like to have them show up in a better quality.
>>
>> What are the right options to change ?
> 
> All images are simply converted during compilation without any change of size or
> resolution. In the english version, many figures are screenshots with only 72dpi
> resolution. You are right they sometimes could be better, but I don't know of
> any parameter for dvipdf or dvips conversion that make the images look better,
> except using images with a higher resolution - just my 2c.
> 
> Regards,
>  Otto
> 

Hi Otto,

It is not a matter of size or resolution but of jpeg artifacts due to a 
drastic compression, when I compare the png/eps they do not show these 
blocks but the jpgs included in the pdf are full of it. I think  the 
quality setting used by convert is below 60%, if we could get it up to 
75% the images would be less blocky and still around 5% of the size of 
the pngs