mtfurlan / colourspace-fader

Colourspace library

Goal: get a nice colour fade that looks like each colour is equal

Approach

In CIELCHab, with a static L and C, iterate over h.

• convert CIELCHab to RGB
• convert RGB to CIELab, calculate difference from last RGB point
• while under min diff, keep iterating h
• store last CIELCH
• output

Issues

It's a bit jumpy with CIE74/94 ΔE(Or I did the hue stuff wrong, changed it since I stopped using these), kinda slow with CIE2000 ΔE, and it stays too long on blue.

Layout

• lib/colurConvert
  • yy_color_converter with extra wrappers and ΔE functions
  • Needs to be combined and cleaned up
  • needs to become actual PIO library with it's own tests and such
• test/testColourConvert
  • testing colourconvert library
• src/main.ino
  • actual colourfade!

Sources

• https://github.com/ibireme/yy_color_convertor
• http://www.brucelindbloom.com/index.html?Math.html

Debug stack dump on ESP8266

java -jar /tmp/EspStackTraceDecoder.jar ~/.platformio/packages/toolchain-xtensa/bin/xtensa-lx106-elf-addr2line  ./.pio/build/d1_mini/firmware.elf dump