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Andrew Coppin <orp### [at] btinternet com> wrote:
> You've never heard of a transparent GIF??? OK, it only supports 1-bit alpha
> (i.e., transparency = 100% or 0%, not in between). But you can animate it.
GIF does not support an alpha channel.
You can define that one of the colors is (completely) transparent, but
that's not an alpha channel. An alpha channel means that every color,
besides having red, green and blue values, also has a fourth component,
the transparency (ie. alpha) value. That is, colors have four components
instead of three.
> Wasn't really a "serious" suggestion ;-)
I know. I just wanted to clear any misconceptions that might arise.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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Andrew Coppin wrote:
>
> You've never heard of a transparent GIF??? OK, it only supports 1-bit alpha
> (i.e., transparency = 100% or 0%, not in between). But you can animate it.
>
> Wasn't really a "serious" suggestion ;-)
> Andrew.
The New GIF format has an alpha channel but it is still in beta.
Remco
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Phil Clute wrote:
> Probably not the answer you're looking for but you
> could render it with a blue or green screen.
We tried that, and it doesn't work well with transparent
areas...
Currently, we render with a black background and use
some additive compositing.
Fabien.
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