On 01.09.2010 11:17, [email protected] wrote:
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
Hi,
i've actually done something similar, customized rendering pipeline to
check whether final rendering should be transparent or not.
Would it be feasible to add this kinda support directly to mapnik core?
Dražen
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