Hans Meine wrote:
> Maybe we should use clear terms, then.  Apart from defining what a color is (I 
> don't intend to do so here), it appears to me as if the 
> terms "mixing", "blending", and "overlay[ing]" were used interchangably in 
> this thread.
> 
> If you want to "mix" QColor::red and QColor::white, maybe there should be a 
> corresponding mixColor() function, too? (Which could e.g. linearly 
> interpolate between the RGBA vectors, without using any alpha formulas.)  
> That does not follow any graphics theory, but might be something expected by 
> users?

It seemed to me that several people expected that. It's also what you do 
when making bands in gradients.

> IMO, the term "blending" refers to alpha blending only, which is a specific 
> type of "overlay[ing]" (cf. OverlayMode).

I suggested providing both. I would be happy to have:
   mix[Colors](QColor,QColor,<amount>)
- and -
   overlay[Colors](QColor,QColor,<composite mode>)

I guess that's more clear than either being named 'blend'?

-- 
Matthew
Ideas in this e-mail are larger than they appear and the writer may be 
smarter than he appears.