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Posted by Onideus Mad Hatter on 01/12/07 22:06
On 12 Jan 2007 02:26:05 -0800, sl@f0r7r355.org wrote:
>Onideus Mad Hatter wrote:
>
><snip>
>
>> What I'm really curious about though...is just what the fuck *IS* a
>> "premultiplied RGB value"...I mean...what the fuck is it multiplying
>> it by? Where's the equation examples of that? Why the fuck after
>> spending HOURS searching the Internet I can't even find ONE reference
>> to it?
>
>See wikipedia:
>http://en.wikipedia.org/wiki/FLV
>
>and do a find for premultiplied.
....uh...thanks...except that, that doesn't actually give an
explanation for what it REALLY is...nor does it give any sort of
equation.
*shrugs*
*tries clicking the link for "alpha premultiplied" and crosses
fingers*
:If an alpha channel is used in an image, it is common to also multiply
:the color by the alpha value, in order to save on additional
:multiplications during the compositing process. This is usually
:referred to as premultiplied alpha. Thus, assuming that the pixel
:color is expressed using RGB triples, a pixel value of (0.0, 0.5, 0.0,
:0.5) implies a pixel which is fully green and has 50% coverage.
....wow...even Wikipedia FAILS to explain it with anything other than
the most simplistic glazing jive of redundant incoherency. Tsch,
tsch, tsch...a simple formula/equation is just TOO MUCH to ask
apparently. Oh how the mighty web has fallen.
--
Onideus Mad Hatter
mhm ¹ x ¹
http://www.backwater-productions.net
http://www.backwater-productions.net/hatter-blog
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