Implement ΔE ITP (Delta ICtCp) about color.js HOT 5 CLOSED

Also ΔICtCp Color Difference Metric by Catherine Meininger
https://kb.portrait.com/help/ictcp-color-difference-metric
https://www.youtube.com/watch?v=X1cG6T8XK4c

and

ITU Recommendation BT.2124-0 (01/2019)
Objective metric for the assessment of the potential visibility of colour differences in television

ITU shortened the name to ΔE ITP

from color.js.

Also the reported value should, for easy comparison with other delta Es, apply two scalar normalization factors (as mentioned by Pieri et al):

1. 0.25 on Ct (to undo the scaling introduced for YCbCr compatibility for content transmission)
2. 720 globally

This results in Delta E ICtCp of one being a JND.

from color.js.

On HDR JND datasets, ΔE 2000 over-predicts difference for luminance changes in darker colors (luminance 100 cd/m2) and under-predicts for luminance changes in lighter ones (10,000 cd/m2) compared to 1,000 cd/m2. Diffuse media white would be 203 cd/m2 here.

ΔE ITP is much more consistent across those luminance ranges.

ΔE 2000 under-predicts chromatic changes for WCG and HDR datasets.

from color.js.

The recommendation from Portrait Displays is to report both values, for professional broadcast monitor calibration

from color.js.

ΔE ITP is now implemented

from color.js.