Hello,
I'm trying to create a watermark on an image by using the app engine
images composite function. However the function doesn't seem to
respect the transparency in my overlay image, which is just a
copyright symbol. It fills the transparent area with white so the
final output looks like this http://bayimg.com/image/eaaagaacb.jpg. I
have tried all sorts of combinations for opacity and image types but
nothing seems to work right. Please advise.
[code]
def post(self):
im = avatar = self.request.get("image")
image = images.Image(im)
result = urlfetch.Fetch('http://upload.wikimedia.org/wikipedia/
commons/5/58/Red_copyright.png')
copyright = result.content
new_image = images.composite([
(im, 0 ,0, 1.0, images.TOP_LEFT),
(copyright, 0 ,0, 0.5, images.CENTER_CENTER)],
image.width,
image.height,
0,
images.PNG)
self.response.headers['Content-Type'] = "image/png"
self.response.out.write(new_image)
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