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bmp2array4bit.py creates C (or C++) code that contains two arrays for adding images to four-bit sprites. See Sprite_image_4bit for an example.
It is loosely based on Spark Fun's bmp2array script.
You'll need python 3.6 (the original use Python 2.7)
usage: python bmp2array4bit.py [-v] star.bmp [-o myfile.c]
Create the bmp file in Gimp from any image by:
. Remove the alpha channel (if it has one) Layer -> Transparency -> Remove Alpha Channel . Set the mode to indexed. Image -> Mode -> Indexed... . Select Generate optimum palette with 16 colors (max) . Export the file with a .bmp extension. Do NOT select options: . Run-Length Encoded . Compatibility Options: "Do not write color space information" . There are no Advanced Options available with these settings
I don't have photoshop so cannot help you with that.
The first array produced is the palette for the image. The second is the image itself.