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Rename matrix _min_v to _m_inv because it's the inverse of _m #41

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merged 3 commits into from
Dec 9, 2022
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Rename matrix _min_v to _m_inv because it's the inverse of _m #41

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f23b994
Rename _min_v to _m_inv
planet36 Dec 2, 2022
3af2a80
Add comments that describe constants
planet36 Dec 2, 2022
3ebfa76
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planet36 Dec 2, 2022
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14 changes: 8 additions & 6 deletions hsluv.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,17 +10,19 @@
from functools import wraps as _wraps, partial as _partial # unexport, see #17
import math as _math # unexport, see #17

# XYZ-to-sRGB matrix
_m = [[3.240969941904521, -1.537383177570093, -0.498610760293],
[-0.96924363628087, 1.87596750150772, 0.041555057407175],
[0.055630079696993, -0.20397695888897, 1.056971514242878]]
_min_v = [[0.41239079926595, 0.35758433938387, 0.18048078840183],
# sRGB-to-XYZ matrix
_m_inv = [[0.41239079926595, 0.35758433938387, 0.18048078840183],
[0.21263900587151, 0.71516867876775, 0.072192315360733],
[0.019330818715591, 0.11919477979462, 0.95053215224966]]
_ref_y = 1.0
_ref_u = 0.19783000664283
_ref_v = 0.46831999493879
_kappa = 903.2962962
_epsilon = 0.0088564516
_kappa = 903.2962962 # 24389/27 == (29/3)**3
_epsilon = 0.0088564516 # 216/24389 == (6/29)**3


def _normalize_output(conversion):
Expand Down Expand Up @@ -124,9 +126,9 @@ def rgb_to_xyz(_hx_tuple):
rgbl = (_to_linear(_hx_tuple[0]),
_to_linear(_hx_tuple[1]),
_to_linear(_hx_tuple[2]))
return (_dot_product(_min_v[0], rgbl),
_dot_product(_min_v[1], rgbl),
_dot_product(_min_v[2], rgbl))
return (_dot_product(_m_inv[0], rgbl),
_dot_product(_m_inv[1], rgbl),
_dot_product(_m_inv[2], rgbl))


def xyz_to_luv(_hx_tuple):
Expand Down