I've been working on creating a map for the house I'm renting as there isn't currently one - yes I know it's simple but figured it was a good starting/learning point.
Managed to get the first floor done without any problems. Read up on how to do multi-floor maps and worked on getting the 2nd floor done. All looked good until I went to save it as a DDS file (using GIMP as my editor). It gives me a message
DDS: It appears your image may be a volume map,
but not all layers are the same size, thus a volume
map cannot be written.
I didn't get this with the first floor so I don't know what I did different nor how to fix it. Any help?