On 22 Mar 2015, at 13:35, Nicolai Hess <nicolaihess@web.de> wrote:

2015-03-22 12:43 GMT+01:00 Nicolai Hess <nicolaihess@web.de>:

2015-03-21 15:51 GMT+01:00 Eliot Miranda <eliot.miranda@gmail.com>:

Why not take the average of alpha in all cases?

Eliot (phone)

On Mar 21, 2015, at 6:32 AM, Aliaksei Syrel <alex.syrel@gmail.com> wrote:

Or weight the argument by its alpha and don't change the alpha of the receiver:

Color white - (Color white alpha:0) = Color white

Color white - (Color white alpha:0.5) = Color gray.

Color white - (Color white alpha:1.0) = Color black.

For what do you need the color arithmetic ?

Maybe there are already other operations defined on Color that you can

used instead.

As the arithmetic operations on Color doesn't work (for years?), maybe we should remove

the operation now, and replace them with a more verbose api

addRGB/ addRGBA/ subRGBA ....

nicolai

Ah, this issue is already closed. That was a rather short discussion. And #/ and #* still don't work

for colors.