IIRC, PIL does not support 8bit pngs with transparency, so writing it
to a file won't help. If you need alpha, you'll have to stick with
32bit pngs.
--
thomas
On Fri, Sep 7, 2012 at 3:35 PM, Jelmer Baas <b...@speerit.nl> wrote:
> Hi All,
>
> I've been testing today in Python, trying to get a MapScript imageObj into an
> python Image object. This works via the following code:
>
>
> map.transparent = MS_ON
> map.selectOutputFormat('png8')
> map.outputformat.imagemode = MS_IMAGEMODE_RGBA
> map.outputformat.transparent = MS_ON
>
> img = map.draw()
> mem_png = StringIO.StringIO(img.saveToString())
> _img = Image.open(mem_png)
>
> However, the _img file lost its transparency, even though it's still (or
> again) PNG. There MUST be a better way of getting the PNG file into PIL,
> right? Something besides writing it to a tempfile, opening it, and deleting
> it?
>
> On a side note, I only use this rendered image temporarily, I only need to
> cut it up in smaller bits and return those to my client. So if there's some
> sort of format that supports transparcency but without the PNG compression
> overhead, that would be even better!
>
> Regards,
> Jelmer Baas
>
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