If you are using home made Led pixel Poi, you need to convert your images to pixel array to upload to your micro controller. Here is simple utility that converts your image to an array for APA102 leds or any other 24 bit leds. This outputs an array that you can copy and paste into your micro controller file. The output is set up for Arduino or Teensy output.
You can convert your images here:
Pixel Poi Image converter