[Tilecache] Where in TC code is metatile cutting?

[Roger André]

Yes, the goal here is to create 8-bit paletted PNG's with transparency.  The
renderer (MapServer) creates these properly, however TileCache is not able
to preserve this format when metatiling is enabled.
--

On Mon, Jan 18, 2010 at 8:29 AM, Mark Deneen
<mdeneen+tiles at saucontech.com<mdeneen%2Btiles at saucontech.com>
> wrote:

> Ivan,
>
> You are attempting to create 8 bit _transparent_ png files?
>
> If so, our goals are different.  Are you making a layer to add on top of
> another?
>
> Mark
>
> Ivan Mincik wrote:
> > Hi, good shot. As it is written there 'png8:filename.png' is what makes
> the correct type of image .
> > I did following test:
> >
> > from pythonmagickwand.image import Image
> > i = Image('test.png')
> > i.format = 'PNG'
> > i.save('png8:out.png')
> >
> > Resulting image IS 8bit paleted image, BUT with the same problem as in
> PIL. The transparency value for each color is set
> > to 255 like in this example:
> >
> > MapServer palette output:
> > -----------------
> >     0: 0,0,0,0
> >     1: 251,0,0,64
> >     2: 250,0,0,54
> >     3: 253,0,0,114
> >
> > ImageMagick output:
> > -----------
> >     0: 0,0,0,0
> >     1: 251,0,0,255
> >     2: 250,0,0,255
> >     3: 253,0,0,255
> >
> > Can somebody else play with this to confirm that we are not able to solve
> this problem with PIL and neither with
> > ImageMagick ?
> >
> > Ivan
> >
> > ------------------------------------------------------------------------
>
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