He said he doesn't want to convert his large collection of jpg to iff, just load them into DPaint transparently.
Datachrome is what you want. It doesn't work 100% of the time with DPaint. The lack of file format support by DPaint even in V 5 was its biggest failing, particularly as it started to offer 24 bit support- why offer 24 bit, but no way to load jpeg format whose very existence is to keep 24 bit pictures at a manageable size? Why not have built in support for datatypes that works, when datatypes was one of the unique characteristics of Workbench that set it apart from the rest. Jpeg was certainly not something that came after Dpaint 5, EA just chose not to implement support for it. Too much work for a dying platform.
I may have datachrome at home somewhere . It was not on Aminet, but commercial software that I got on a cover CD. I'll pmail you if I have it..