[reportlab-users] Transparent fill of shapes
robin at reportlab.com
Wed Apr 9 09:26:18 EDT 2008
Jiří Mikulášek wrote:
> I am trying to implement printing of shapefiles to PDF. All is going
> quite nice but now I got
> stuck with the following problem. Our application allows to draw some
> shapes with
> a semitransparent fill and we would like to preserve this ability when printing.
> Is this possible with Reportlab (I did not find any evidence of such
> functionality so far,
> but I might have missed something obvious, hopefuly ;-)?
> If not do you know whether someone is working on this? If not are
> there any hints or advice
> how to implement such a feature into Reportlab?
> Thank you very much
> Jirka Mikulasek
We don't support models other than simple Device GRAY/RGB/CMYK color spaces at
present. There is some support for transparency in images, but I guess you mean
the ability to set the opacity of a fill. So far as I know we can't yet do that.
In PDF we apparently have to create so called Transparency Group XObjects and
use those instead of ordinary objects; that's before all of the color space and
blend function issues.
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