I've checked out the cortex website and the eclipse
looks very tempting.
As for progs which work in 16m colours, i have
da'spicture, but this only loads and saves tifs and i find it quite difficult to re-size pics.
I use mGIF all the time, its a very neat program, its was i that suggested it to be added to topp.atari-users.net ;-)
However it doesn't scale colour pictures very neatly, and it doesn't save jpegs.
I look forward to a new version.