[reportlab-users] Transparent png

[Arkadi Colson]

I tried it and the result is this:

The black square should be a transparent image and looks like this:

Both are png images.
The first one which is appearing correctly is "PNG image data, 48 x 48, 
8-bit/color RGBA, non-interlaced". The black square is "PNG image data, 
48 x 48, 8-bit gray+alpha, non-interlaced".

Any idea why the "gray+alpha" isn't showing up correctly?

Thx!


On 23-05-17 18:37, Tim Roberts wrote:
> Arkadi Colson wrote:
>> Does anybody know if it's possible to use tranparent png images with the
>> code below:
>>
>> self.data[x][y] = Paragraph(
>>                               '<img src="' + filename + '"
>> valign="middle"/>', style=self.style_def)
> Wouldn't it have been quicker just to try it?
>
> Although I don't know the answer, I will point out that transparency has
> always been a tricky issue with PostScript and, by extension, PDF.  Both
> standards were designed with paper and printing in mind, where
> transparency does not exist.  Most professional print shops will not
> accept PDF files with embedded transparency, because it's not clear what
> that means.
>

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