[reportlab-users] RGBA Colors

King Simon-NFHD78 simon.king at motorola.com
Thu Nov 26 06:48:50 EST 2009

> -----Original Message-----

> From: reportlab-users-bounces at lists2.reportlab.com

> [mailto:reportlab-users-bounces at lists2.reportlab.com] On

> Behalf Of Andy Robinson

> Sent: 26 November 2009 10:46

> To: For users of Reportlab open source software

> Subject: Re: [reportlab-users] RGBA Colors


> 2009/11/26 Robin Becker <robin at reportlab.com>:

> > My preference for an interaction between the canvas and

> colour alphas would

> > be something like a set of rules for the colour behaviours


> I think we should step back a bit. First of all, is anyone on this

> list apart from Kevin using opacity?

I'm using it, but only via the patch that I originally provided against
a relatively old revision revision of ReportLab. However, the main
reason for doing this was to make a matplotlib backend that used
reportlab graphics, and I would be happy to update that backend to use
colours with an alpha attribute instead of the strokeOpacity/fillOpacity
attributes that I use at the moment, if that's the way you want to go.

(I still need to discover why my code doesn't work with the current
ReportLab opacity implementation, but I haven't spent any time tracking
it down)


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