[Image-SIG] Bad antialias? (in Python Imaging Library 1.1.5)

[Laszlo Zsolt Nagy]

>Apparently, antialiasing will use a mixture of the background color and 
>the text color on the edges.
>I think this is good only if the background is fully opaque. Is there a 
>workaround?
>  
>
I can already give the correct transformation (I checked this with a 
very slow putpixel/getpixel iteration):


function overlay(image1,image2) -> image

For each pixel

INPUT:
    image1 = R1,G1,B1,A1
    image2 = R2,G2,B2,A2

OUTPUT:
    (R1*A1 + R2*A2)/A1+A2,(G1*A1 + G2*A2)/A1+A2,(B1*A1 + B2*A2)/A1+A2,A1+A2

But I cannot do this in PIL. Is it possible at all? This would be a very 
good extension, and it would solve the text antialiasing problem too.

  Les