sRGB to xterm-16/xterm-256-color conversion based on following script: https://github.com/PratikBhusal/xterm-color-comparison/blob/main/color_comparison.py
sRGB to xterm-16/xterm-256-color conversion based on following script: https://github.com/PratikBhusal/xterm-color-comparison/blob/main/color_comparison.py