Enhanced constants precision

[maandree]

Hi! I'm working on a similar C library.
https://github.com/maandree/libcolour

[dy]

Awesome!
Feel free to take any code you may find useful.
Also if you have rare color-spaces - youre welcome to contribute!

[maandree]

I don't think I have any colour space you don't, except a lot of RGB colour spaces, but if I get any you don't have, I will let you know.

I do however have very exact numbers and not the rounded numbers you find everywhere.

Here are some things I have that might be interesting:

Standard illuminants with values calculated from the wavelength tables:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/libcolour.h#L65-L106

sRGB transfer function encoder/decoder with very exact values:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/common.h#L41-L65

Not sure if this will make any difference in JavaScript, but I have a bit more precise matrix for conversion from sRGB to CIE XYZ:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/matrices.py#L114-L122

A bunch of RGB colour spaces:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/libcolour-template.c#L362-L632
with their transfer functions:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/libcolour-template.c#L255-L332

And support for custom RGB colour spaces:
https://github.com/maandree/libcolour/blob/d9fd5eb7fbbcbf47c7398c591d7eda0ef2c5cce7/libcolour-template.c#L129-L227

[dy]

Ok, that is a possible enhancement

[demurgos]

I agree that it would be great if you could clarify the situation around RGB color spaces. I'd say that most people refer to "sRGB" when they say "RGB" but there are many other variants such as linear RGB, CIE RGB or all the variants in maandree's project.

[maandree]

It is worth noting that is not uncommon that the term RGB is used to refer to CIE RGB without its transfer function.