[Tilecache] Meta Tiled paletted images - PIL issue

soatley shawn at niagarafalls.ca
Fri Oct 23 11:58:37 EDT 2009



Ivan Mincik-2 wrote:
> 
> On Friday 23 October 2009, you wrote:
>> I don't think many programs/libraries work with paletted transparency in
>> PNGs. Nor does PIL. So I'm just writing to confirm that this is a missing
>> feature of PIL.
>> Tibor
> 
> No solution found also after writing to PIL mailing list, so we can not
> use nice optimized images produced by UMN Mapserver.
> We decided to produce RGBA images from Mapserver and write a "patch"  to
> Tilecache to optimize images just after creation using external tools like
> pngnq of optipng.
> 
> Ivan 
> 

We use OptiPNG here and it works pretty good, but unfortunately, it does
take a fair amount of time to run.  On some of our larger layers (ortho) it
saves a lot of space.

Shawn

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