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 _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
