[reportlab-users] RGBA Colors

[Kevin D Smith]

On Dec 3, 2009, at 9:12 AM, Andy Robinson wrote:

> 2009/12/3 Kevin D Smith <Kevin.Smith at sixquickrun.com>:

>>> As for the colour alpha patch there are two proposals

>>> 

>>> 1) use default None with that meaning don't touch canvas alpha.

>>> 

>>> 2) use default 1 with that implying that canvas alpha is defunct since ordinary colours will always override any existing canvas alpha.

>>> 

> 

> I can live with either.  Robin, I leave the final decision with you

> but let's decide and get it in there quickly so we can start

> documenting it.

> 

> Which ever way we go, in our docs we will tell people clearly that

> there is an 'old' and 'new' way and it's best not to mix them.

> 

> For a major new version, or a recommendation for a newbie, I would

> personally shoot straight for (2).  Whether you use graphics,

> platypus, or homegrown reusable code, most people would rather

> "describe the colours they want" than have to do state tracking.

> 

> -- 

> Andy



I will say one more thing about 2 though before leaving the decision up to those in charge.  I wouldn't remove the old alpha methods, because it appears as though they work for images as well.  I could see someone wanting to use it for that.  Of course, you could also add an alpha argument to the image methods just like the colors to take care of that.

Kevin D Smith
Kevin.Smith at sixquickrun.com