Hi
We are making an open source project, http://plone.org/products/subskins
I have been trying over and over again to find a way to let PIL
colorize an image.
It should work like this:
1) I have a greyscale image
2) A color is selected, for example "#123456"
3) The image is colorized in this way:
Whatever was white is still white
Whatever was black (100%) is now "#123456"
Whaterver was grey (50%) is now 50% of "#123456"
I have tried a lot of different approaches, but the colors always
come out too dark. Is there a way to do this ?
The code is here:
http://svn.plone.org/svn/collective/Products.PloneSubSkins/trunk/
Products.PloneSubSkins/Products/PloneSubSkins/browser/views.py
where the lines about this are:
______________________________________
class ColorizedImage(BrowserView):
def __call__(self):
portal_skins = getToolByName(self.context, 'portal_skins')
img = portal_skins.restrictedTraverse(self.request.img)
input = StringIO()
input.write(img._data)
input.seek(0)
image = Image.open(input)
newimage = colorize(image, self.request.color)
output = StringIO()
newimage.save(output, format='PNG')
self.request.response.setHeader('Content-Type','image/png')
return output.getvalue()
def colorize(image, color):
color = color[1:]
assert len(color) == 6 or len(color)==3
if len(color)==6:
r,g,b = int(color[:2],16),int(color[2:4],16),int(color[4:7],16)
elif len(color)==3:
r,g,b = int(color[0],16)*16,int(color[1],16)*16,int(color[2],
16)*16
palette = make_linear_ramp((r,g,b))
if image.mode != "L":
image = image.convert('L')
image.putpalette(palette)
return image
#Thanks to http://effbot.org/zone/pil-sepia.htm for the snippet
def make_linear_ramp(white):
# putpalette expects [r,g,b,r,g,b,...]
ramp = []
r, g, b = white
for i in range(255):
ramp.extend((r*i/255, g*i/255, b*i/255))
return ramp
__________________________________________
Espen
_______________________________________________
Image-SIG maillist - Image-SIG@python.org
http://mail.python.org/mailman/listinfo/image-sig
