I see elsewhere on this forum, Codekiller is selling ECL to VGA adapters for the TT.
A while ago, a few of us on the C128 forums were discussing the possibility of improving the low/weird colour output of the RGBI video output.
One possibility that was discussed was the use of a CLUT/RAMDAC system.
Has someone ever tried this for the TT with a ECL to VGA adapter?
An 8-bit CLUT would be fairly doable or perhaps a 12-bit if you want the full TT colour range to be covered.
Im surprised, no one has tried this before or at least not discussed it.
I can only suppose that VME GFX cards are probably a more straightforward upgrade.