Ideally you would have an output module with a lot of control fine-tuning
AD Pro absolutely provides this. Although, in WB 1.3 it's more sliders/numbers and you don't know the result until after you move things around then go look. In 2.0, they do provide the ability to see and customize the palettes.
Here's a nice advertisement for it.
About half-way through they show how they take a 24 bit-plane image and convert it down to 256 colors, and then add dithering (or not).
It's a lot like Photoshop without the painting features. Tons of import/export options as well as operators like scaling, blurring, cropping, adding text/animation, etc. I'll shoot you this tonight so you can play around with it.
It's pretty awesome.
Here's a manual
you can dig through to see what you might want to try later this week. It's a very powerful program.
AD Pro will read A-HAM images in the same file format (as registered with
CATS, Commodore Applications and Technical Support) used by NewTek's
Dynamic HAM image files.
That being said, further down the page they mention hot it isn't fully
supported, but can be read. Anyway, have fun experimenting and let us see what you come up with!