As later discovered while developing the main device's LCD interface, using this website to convert images to the TFT library's format may cause the images to be flipped.
As inverting bits is not an easy task, this tool helps with that.
Also, at the same time, we needed an easy RGB888 to RGB565 converter because the TFT library uses 16-bit colors. So, this is the combo tool we created.
There's nothing really special in the commands, just follow the steps and you should be good to go. This is compilable in Windows and Linux using CMake.