Continuing with the previous post, I’m sharing the black and white converter for the Adafruit 1.44″ TFT. This program converts any .PNG image into a constant char array that can be included and shown directly on screen. This program and accompanying code shows monochrome bitmaps (custom foreground and background colors) on the ST7735R driver. It was tested on a green tab TFT and is substantially much faster than the stock bitmap drawing routines.
Adafruit monochrome image converter