Hot to convert an image like PNG into a useable graphic bin file

ats3788 · December 9, 2025, 11:33am

fbiego · December 9, 2025, 1:47pm

You can use this python script

lvgl/lvgl/blob/master/scripts/LVGLImage.py

#!/usr/bin/env python3
import os
import logging
import argparse
import subprocess
from os import path
from enum import Enum
from typing import List
from pathlib import Path

try:
    import png
except ImportError:
    raise ImportError("Need pypng package, do `pip3 install pypng`")

try:
    import lz4.block
except ImportError:
    raise ImportError("Need lz4 package, do `pip3 install lz4`")

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dr_glenn · December 30, 2025, 5:46pm

The answer from fbiego is excellent!
Recently I needed to convert a JPEG into a strictly B&W image for ePaper display. I needed to resize, convert to black or white pixels, and write the image as an array of unsigned chars.
I simply asked Gemini to create the code for me and a few seconds later it was done!
I’m not saying all tasks should be done this way, but these simple utility needs are well handled by AI.

ats3788 · February 10, 2026, 9:21am

Thank you but how to use the script properly
I tried

Als C-Array exportieren

python3 script.py --ofmt C --cf RGB565 input.png

Als BIN-Datei mit Kompression

python3 script.py --ofmt BIN --cf ARGB8888 --compress LZ4 input.png

Ganzen Ordner konvertieren

python3 script.py --ofmt C --cf I8 /pfad/zum/ordner/

Mit benutzerdefiniertem Namen

python3 script.py --ofmt C --cf RGB565 --name mein_bild input.png
but no output no message from the script just nothing

fbiego · February 10, 2026, 5:25pm

This seems correct, you did not specify the output folder, so it uses the default “ouptut” which should have been created.

Screenshot 2026-02-10 at 20.24.15