Hi Looking at the Bitmap class, I presume (I've not tried) that when you call Bitmap.createBitmap() with a buffer of pixel data, it's these pixels that contain the alpha data (look at the Color class for the layout of the 32 bit integer value of a pixel), and the Bitmap.Config that you use to ensure that the alpha channel is not ignored (i.e. you should use Bitmap.Config.ARGB_8888).
On Jan 12, 5:55 am, Stephen Lebed <srle...@gmail.com> wrote: > I've created a bitmap that I'm overlaying over another bitmap. I'd > like to alter the transparency of sections of the overlaid bitmap, > revealing the bitmap beneath. I can't find a way to write only to the > alpha channel of the overlaid bitmap. > > For example, I have a bitmap filled with red pixels, and an alpha that > is 255, opaque. A solid red bitmap. How do I draw a circle on this > map that would lower the alpha values toward 0, transparent? > > Any help would be greatly appreciated! > > Stephen
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