RE: [Algorithms] Glowing objects

[Jon W. <hp...@mi...>]

> Yeah, premultiplied alpha is cool, but I always find it hard to convince
> artists to use it. Probably has something to do with the fact that it is
not
> very straight-forward to author it in Photoshop. :) Do you know of any
tools
> that help?

Try something like this:

1) set up an alpha channel
2) make the alpha channel all white
3) paint blackness into the alpha channel where you want the background to
be
   blotted out
4) select all and invert the alpha channel
5) make RGB all black
6) paint colors into RGB where you want to brighten/color the particles

Typically, you'll need to darken the background more than you think, and you
need to add less RGB than you think, so painting the thing first, and then
adjusting brightness of alpha up, and of RGB down, often helps.

Cheers,

			/ h+