The export .png command is used to save your sprite sheet as a 128x128 image of all 4 tabs of the sprite sheet arranged vertically. For example, here are the four sprite sheet tabs exported, and for comparison is the Jelpi demo game's exported spritesheet.
It is important to know that the lower half of the sprite sheet and the lower half of the map share the same data space. This is why Jelpi's sprite sheet looks strange. Tab #2 and #3 are not being used by the sprite graphics data and instead, they are being used by the map graphics data.
16 Apr 2023