Found a scan doubler ( who would like one ) ?

[JosephC]

AGA isn't capable of *outputting* smooth gradients, since it can't simultaneously display the amount of colors necessary for that

Dead wrong.  100% incorect, false and untrue.  You should be ashamed of yourself.

[JosephC]

HAM8 gradients don't look right because of the way HAM works.

You have it all backwards.

HAM8 gradients are the only thing that do look right because of the way HAM8 works.

When the color changes wildly from 1 pixel to the next you get fringing on HAM8.  When the colors are a smooth gradient you get beauty and elegance on HAM8.