A script that takes RGB hex codes like a0df00 and prints a luminance value
for them. Like the Y in YIQ.
I did this in Python centuries ago, for determining accessibility of contrast on a long-dead theme for my website. This version is rewritten in Rust.
This uses the luma coefficients from Rec. 601 (CCIR 601), that is:
Y'[601] = 0.299*R' + 0.587*G' + 0.114*B'
I did not know about BT. 709 at the time, and there are no plans to support it.
Apache 2.