Hi,
I'll just patch mapnik's ogcserver (if you are using it, of course). We are
using a copy of ogcserver for each wms service instead of a global installed
one. This means there is no problem in doing such an ugly hack :) because it
will affect just that service.
The image won't hit the disk until cached and it will also save you the hassle
of running a script afterwards. Tell me if the performance is acceptable,
perhaps we can make a patch until support is added to mapnik.
File common.py:
class WMSBaseServiceHandler(BaseServiceHandler):
def GetMap(self, params):
m = self._buildMap(params)
im = Image(params['width'], params['height'])
render(m, im)
format = PIL_TYPE_MAPPING[params['format']]
import PIL, StringIO
img = PIL.Image.open(StringIO.StringIO(im.tostring(format)))
img = self.reduce_opacity(img, 0.5)
buf = StringIO.StringIO()
img.save(buf, format=format)
return Response(params['format'].replace('8',''), buf.getvalue())
def reduce_opacity(self, im, opacity):
import ImageEnhance
"""Returns an image with reduced opacity."""
assert opacity >= 0 and opacity <= 1
if im.mode != 'RGBA':
im = im.convert('RGBA')
else:
im = im.copy()
alpha = im.split()[3]
alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
im.putalpha(alpha)
return im
> -----Mensaje original-----
> De: [email protected]
> [mailto:[email protected]] En nombre de
> Dražen Odobašic
> Enviado el: martes, 31 de agosto de 2010 14:42
> Para: [email protected]
> Asunto: [Mapnik-users] Mapnik map opacity
>
> Hi,
>
> does Mapnik support setting rendered map opacity, for
> instance i would
> like to have rendered images with 50% opacity?
>
> Thank you
> _______________________________________________
> Mapnik-users mailing list
> [email protected]
> https://lists.berlios.de/mailman/listinfo/mapnik-users
>
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