The commands
are ok, because the function "ImageBuffer()" return the handle of the image buffer, and so it is more quick use a variable (b1,b2,bm) instead calling every time ImageBuffer()... now I'll try your last code... wait!
b1=ImageBuffer(ima1) b2=ImageBuffer(ima2) bm=ImageBuffer(mix)
are ok, because the function "ImageBuffer()" return the handle of the image buffer, and so it is more quick use a variable (b1,b2,bm) instead calling every time ImageBuffer()... now I'll try your last code... wait!