Error message for pcx images

[triplepointfive]

Actually an attempt to load such images fails with Invalid bit depth (0), that's not much descriptive, no clue which file failed or even that it's connected with JP. There is no need to implement loading of that format, it's too ancient, but would be great to have more detailed messages.

[Twinside]

The problem is that it's the TGA file reader which is tried last for loading the file, and as TGA hasn't any signature in it's header, it will only check it's field and that's what's displayed. But yeah it sucks.