LCDAssistant - image2cpp is a simple tool for converting photos into byte arrays (or converting your array back into a photo) for use with OLED (monochrome) screens, such as those found in Arduino or Raspberry Pi projects. This tool is especially useful for programming images on monochrome displays like OLEDs.
GFXbitmapFont
formatted output. Used
by a modified version of the Adafruit GFX library. GitHub
project and example
bitmap-font
If your image looks all messed up on your display, like the image below, try using a different mode.