LMS Plugin using Smith & Pokorny (1975) 2-deg cone fundamentals

lms.py

# pragma: init
"""Convert Linear sRGB to LMS using Smith & Pokorny (1975) 2-deg cone fundamentals."""
from __future__ import annotations
from coloraide.cat import WHITES
from coloraide.spaces import Space
from coloraide import algebra as alg
from coloraide.types import Vector
from coloraide.channels import Channel

LRGB_TO_LMS = [
    [0.178824041258, 0.4351609057000001, 0.04119349692],
    [0.034556423182, 0.27155382458, 0.038671308360000003],
    [0.000299565576, 0.0018430896, 0.01467086136]
]

LMS_TO_LRGB = [
    [8.094435598032371, -13.050431460496926, 11.672058453917323],
    [-1.0248505586646686, 5.401931309674973, -11.361471490598712],
    [-0.03652974715933318, -0.412162807001268, 69.35132423820858]
]


class LMS(Space):
    """The LMS class."""

    BASE = "srgb-linear"
    NAME = "lms"
    SERIALIZE = ("--lms",)
    CHANNELS = (
        Channel("l", 0.0, 1.0),
        Channel("m", 0.0, 1.0),
        Channel("s", 0.0, 1.0)
    )
    CHANNEL_ALIASES = {
        "long": "l",
        "medium": "m",
        "short": "s"
    }
    WHITE = WHITES['2deg']['D65']

    def to_base(self, coords: Vector) -> Vector:
        """To XYZ."""

        return alg.dot(LMS_TO_LRGB, coords, dims=alg.D2_D1)

    def from_base(self, coords: Vector) -> Vector:
        """From XYZ."""

        return alg.dot(LRGB_TO_LMS, coords, dims=alg.D2_D1)

from coloraide import Color as Base

class Color(Base):
    ...

Color.register(LMS())
# pragma: init

Color('red').convert('lms')