Mapserver/GD JPEGs

[Blaise]

Le Mardi 27 Juin 2006 08:35, Stephen Davies a écrit :
> Last week I posted a request regarding comments in JPEGs and their
> apparent effect on Motorola 3G telephones.
>
> Since then I have found that a) the issue seems to affect all WAP phones
> and b) it is not just comments that cause the problem.
>
> It seems that these devices can only handle very simple images and those
> generated by Mapserver/GD fall outside their capabilities.
>
> I have found that, as well as removing the comments from my map images,
> I have to go further.
>
> My current work-around is to use a PERL script to generate the map image
> to disk and then use the mogrify utility from Image Magik to "clean"
> it. The mogrify command is simply:
>
> mogrify -quality 100 image.jpg
>
> but whatever this does to the image is enough to make it displayable on
> a telephone when sent as an img src=.
>
> If anybody knows more about what is happening here and/or what the
> underlying problem is, I would love to hear it.
>
> Cheers,
> Stephen Davies

Hi Stephen
Is it working ok with quality 100 jpeg images ? In this case, you could force 
mapserver to create quality 100 jpeg images with the QUALITY parameter. Check 
this doc :
http://mapserver.gis.umn.edu/docs/reference/mapfile/outputformat/
Regards
Blaise