How to fix colors w/o Booster's Lab

We've already had that discussion. You really do not need to make a separate thread for the same question you've asked.

Also, none of the Cave Story editing software works with NxEngine. You're dealing with a lost cause.

 

True. BTW, I've never used cave editor before.

 

What did you expect?

 

Whatever @Serri

You ask, you get answers. Simple as that. You can however, work on a regular mod with Vanilla and then move the Stage folder to your NxEngine directory. You can't use custom assembly, though (this includes mod loader). But, y'know already...

Whatever.

 

Oh noes, he said forbidden word "nxengine"...

Judging by pathname and log he is trying to use it with vanilla.

 

copy them over... use paint.net or something
save as 24-bit bitmap with transparent being #000000 full opacity