models/okcolor_base
library
Classes
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Cs
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Represents different levels of Chroma (color intensity).
All values are typically non-negative.
C_0: Minimum chroma
C_mid: Middle chroma
C_max: Maximum chroma
Example usage:
Cs cs = getCs(L, a_, b_);
// Different chroma levels are used in interpolation:
double C = k_0 + t * k_1 / (1 - k_2 * t);
// where k_0, k_1, k_2 are derived from cs.C_0, cs.C_mid, and cs.C_max
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LC
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Represents Lightness and Chroma.
L: Lightness, typically in range
0, 1
C: Chroma, can exceed 1 for highly saturated colors
Example usage:
LC cusp = findCusp(a_, b_);
// L and C are used in calculations:
double L_0 = cusp.L + 0.5 * (sgn(Ld) * (e1 - math.sqrt(e1 * e1 - 2 * k * math.abs(Ld))));
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LCH
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Represents a color in the OkLCH color space.
L: Lightness, typically in range
0, 1
C: Chroma, non-negative value
h: Hue angle in radians, typically in range 0, 2π
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OkHSL
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Represents a color in the HSL (Hue, Saturation, Lightness) color space.
h: Hue, in range
0, 1 representing 0 to 360 degrees
s: Saturation, in range 0, 1
l: Lightness, in range 0, 1
Example usage:
HSL hsl = srgbToOkhsl(RGB(0.5, 0.5, 0.5));
// Hue is used in trigonometric functions:
double a_ = math.cos(2 * math.pi * hsl.h);
double b_ = math.sin(2 * math.pi * hsl.h);
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OkHSV
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Represents a color in the HSV (Hue, Saturation, Value) color space.
h: Hue, in range
0, 1 representing 0 to 360 degrees
s: Saturation, in range 0, 1
v: Value, in range 0, 1
Example usage:
HSV hsv = srgbToOkhsv(RGB(0.5, 0.5, 0.5));
// Saturation and Value are used in calculations:
double L_v = 1 - hsv.s * S_0 / (S_0 + T_max - T_max * k * hsv.s);
double L = hsv.v * L_v;
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OkLab
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Represents a color in the Oklab color space.
L: Lightness, typically in range
0, 1
a: Green-red component, typically in range -0.5, 0.5
b: Blue-yellow component, typically in range -0.5, 0.5
Example usage:
Lab lab = linearSrgbToOklab(RGB(0.5, 0.5, 0.5));
// lab components are used directly in calculations:
double C = math.sqrt(lab.a * lab.a + lab.b * lab.b);
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RGB
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Represents a color in the RGB color space.
All components are typically in range
0, 1 for sRGB.
For linear RGB, values can exceed 1 for colors outside the sRGB gamut.
Example usage:
RGB rgb = oklabToLinearSrgb(Lab(0.5, 0.1, -0.1));
// Values are clamped when converting to sRGB:
double r_srgb = srgbTransferFunction(rgb.r);
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ST
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Alternative representation of (L_cusp, C_cusp)
Encoded so S = C_cusp/L_cusp and T = C_cusp/(1-L_cusp)
The maximum value for C in the triangle is then found as min(SL, T(1-L)), for a given L
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XYZ
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Represents a color in the CIE XYZ color space.
X: X coordinate
Y: Y coordinate
Z: Z coordinate
