[Lush-users] what does image-read-rgba do with rgb images?

[Ralf J. <jue...@cs...>]

Hi,

I noticed that when I read an RGB image using image-read-rgba
then the alpha channel is not zero as the help text suggests
(I think it should be 255 instead).
It is not even constant but seem to contain a greyscale version
of the image. Any idea what the alpha channel values mean?

Ralf