On 3/3/07, saulgoode@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx <
saulgoode@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
For Indexed Mode Images, the resulting pixel is the active BG color if the layer has no alpha and S > 0.5, (emptiness) if S > 0.5 and the layer has an alpha channel, and unchanged if S < 0.5.
Quoting zhang chi < zhangchipr@xxxxxxxxx>:
> http://www.gimptalk.com/forum/topic/My-First-Tutorial-Blending-Images-In-Gimp-106-1.html <gimp-developer@xxxxxxxxxxxxxxxxxxxxxx>
>
> in this tut, after feather,C-i,and C-K is used, but what algorithm is used
> when using Ctrl-k ?
>
> thank you <gimp-developer@xxxxxxxxxxxxxxxxxxxxxx>
If the layer has an alpha channel then the value of the alpha is
scaled by (1 - S) where "S" is the selection mask's value (which spans
the range '0=not selected' to '1=fully selected' -- the selection is
actually a value from 0 to 255).
If there is no alpha channel then the value of each of the components
(RGB) is scaled by (1 - S) and added to the product of the
corresponding component of the active background color and (1 - S).
For Indexed Mode images, the resulting pixel is the active BG color if
S>0.5 and unchanged if S<0.5
For Indexed Mode Images, the resulting pixel is the active BG color if the layer has no alpha and S > 0.5, (emptiness) if S > 0.5 and the layer has an alpha channel, and unchanged if S < 0.5.
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