[reportlab-users] Semi-transparent gradient

[Robin Becker]

Hi Lele,

I think your logic would be correct, but I believe that the linearGradient functionality is ignoring the alpha as you 
suspect.

I did not have any great part in the pdf canvas gradient code. However, I think the problem is in the color definitions 
we are using that are derived from the input colours. I think that is done in canvas._normalizeColor which seems only to 
care about the rgb values.

I seem to recall tha pdf transparency is supposed to apply to objects rather than colours.

I can certainly change the whole gradient using eg


c._setFillAlpha(0.7)

prior to calling c.linerGradient.

On 04/04/2022 12:48, Lele Gaifax wrote:
> Hi all,
> 
> I need to put some text on top of an image, and to make sure it's readable I'm
> drawing a rectangle filled with a semi-transparent color (say,
> rgba(250,250,250,0.6)) and then writing the text over that.
> 
...........
-- 
Robin Becker