Thanks to the docs that gave me the info to be able to program this! 😃
https://gbdev.io/pandocs/
You open a GB or GBC file with the app :) 😏😏😏😏😏
WARNING: The Linux version is buggy and puts random bytes at the beginning of the images. I will try to rewrite it soon
You open a GB or GBC file with the app then you put in the offset of the tile :D
(In GB/GBC roms the tile data starts at 8000)
GB and GBC games supported! 😁😁😁 (The exported tiles from GBC ROMS don't use the in-game palette)