[reportlab-users] bug with image transparency?!
robin at reportlab.com
Tue Oct 21 05:29:06 EDT 2008
Tim Roberts wrote:
> Volker Haas wrote:
>> I guess I just ran into an image which is not rendered correctly using
>> reportlab (version 2.1).
>> All black pixels are rendered white (or transparent on a white
>> The image displays correctly in a browser or image viewer.
>> from reportlab.platypus import BaseDocTemplate, PageTemplate, Frame,
>> from reportlab.rl_config import defaultPageSize
>> doc = BaseDocTemplate("test.pdf")
>> frame = Frame(0,0,defaultPageSize, defaultPageSize)
>> Story = [Image("MergeSampleStep1.png")]
> Very interesting; I think there is some confusion in the code between
> Platypus and canvas about what the "mask" parameter means. In the short
> term, you can work around this by saying:
> Story = [Image("MergeSampleStep1.png", mask=None)]
> At least, that fixed your sample for me.
At present we're not dealing with mode 'P' correctly. We're able to deal with
RGBA CMYK L and RGB. Currently stuff that is in mode P will be converted to RGB.
My reading of the PIL manual suggests that mode P is a palette format with the
actual colour space any of the others. It seems that conversions to L RGB and
CMYK are supported without loss and that the way to convert is to omit the
outcome mode argument. I assume that we would then need to carry the transparent
colour along as a singleton as in with a mask colour. Can you send me a small
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