Hi, "Kevin Myers" <[EMAIL PROTECTED]> writes:
> Does the value of the alpha channel provide the transparency level > for each pixel, and if so, then what does that have to do with > "alpha"? Your guess is right, or rather, almost right. The alpha channel actually provides the opacity levels for each pixel since usually a fully transparent pixel has an alpha value of 0 while a fully opaque pixel has an alpha value of 1.0 (or 100% or 255 or 65535 or ..., depending on how the data is actually stored). > Also, how is level of transparency actually applied in order compute > the final display values for a pixel when a semi-transparent pixel > is overlaid onto an underlying non-transparent pixel? The formula is basically dest = (1 - alpha) * dest + alpha * src We assume that the alpha value runs from 0.0 to 1.0 here. Sven _______________________________________________ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
