GitHub - usetrmnl/unique_colors: A POSIX command line utility to count the number of unique colors in PNG images

usetrmnl / unique_colors Public

Notifications You must be signed in to change notification settings
Fork 0
Star 0

A POSIX command line utility to count the number of unique colors in PNG images

Notifications

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
LICENSE		LICENSE
Makefile		Makefile
PNGdec.cpp		PNGdec.cpp
PNGdec.h		PNGdec.h
README.txt		README.txt
adler32.c		adler32.c
crc32.c		crc32.c
crc32.h		crc32.h
infback.c		infback.c
inffast.c		inffast.c
inffast.h		inffast.h
inffixed.h		inffixed.h
inflate.c		inflate.c
inflate.h		inflate.h
inftrees.c		inftrees.c
inftrees.h		inftrees.h
main.cpp		main.cpp
png.inl		png.inl
zconf.h		zconf.h
zlib.h		zlib.h
zutil.c		zutil.c
zutil.h		zutil.h

Repository files navigation

unique_colors
-------------

Written by Larry Bank
Project started July 24, 2025

An optimized utility designed to count the number of unique colors presesnt in PNG
images. The purpose is to provide optimized images for the TRMNL devices. The current
focus is to avoid sending 2-bit grayscale images when the same image can be represented
as a 1-bit image. This will allow the latest TRMNL devices to use the new image for
a partial (non-flashing) update. It is certainly possible for the TRMNL's ESP32 to
do this same function before doing an update, but it's more efficient (for battery life)
to have this done on the server.