[magick-users] Scaling RGBA game textures where all channels are important

[arcanaimperii at imagemagick.org]

> > my engine) is using independent channels for special purposes

We'll add a patch to IamgeMagick 6.3.5-7 Beta within a few days such
that if you add +matte to your command line it will treat opacity as an
independant channel instead of as an alpha channel.