Gambini, on 08 August 2012 - 03:26 PM, said:
Thanks. Yeah I saw the color in the rightmost bottom but for some reason not even copying a part of another tile would work. I got it working after a couple of minutes of posting that, the workaround is somewhat funny (I´m using photoshop): going to image/palette and clicking that very color turned all pink surfaces into, what we could call, translucent, which AFAIK isn´t something bmp files have. It works so i won´t do further investigations

Paint Shop Pro suits better for indexed color images. What I do is to change the transparent color via built-in palette editor, say, to magenta (255, 0, 255), rather than its VGA version (252, 0, 252), to differentiate it from its duplicate. Then copypasting the images directly into DukeRes works like a charm.