Mixbox for Godot

var Mixbox = preload("res://addons/mixbox/mixbox.gd")

var color1 = Color(0.0, 0.129, 0.522) # blue
var color2 = Color(0.988, 0.827, 0.0) # yellow
var t = 0.5                           # mixing ratio

var color_mix = Mixbox.lerp(color1, color2, t)

print(color_mix)

Mixing Multiple Colors

var z1 = Mixbox.rgb_to_latent(color1)
var z2 = Mixbox.rgb_to_latent(color2)
var z3 = Mixbox.rgb_to_latent(color3)

var z_mix = []
z_mix.resize(Mixbox.LATENT_SIZE)

for i in z_mix.size():          # mix together:
    z_mix[i] = (0.3*z1[i] +     # 30% of color1
                0.6*z2[i] +     # 60% of color2
                0.1*z3[i])      # 10% of color3

var color_mix = Mixbox.latent_to_rgb(z_mix)

Shader

shader_type canvas_item;

uniform sampler2D mixbox_lut; // attach "addons/mixbox/mixbox_lut.png" here

uniform vec4 color1 : hint_color = vec4(0.0, 0.129, 0.522, 1.0); // blue
uniform vec4 color2 : hint_color = vec4(0.988, 0.827, 0.0, 1.0); // yellow

// #include only works in Godot 4, if you are on Godot 3.X
// you will need to paste the Mixbox code here manually.
#include "addons/mixbox/mixbox.gdshaderinc"

void fragment() {
    COLOR = mixbox_lerp(color1, color2, UV.x);
}

Mixing Multiple Colors

mat3 z1 = mixbox_rgb_to_latent(color1.rgb);
mat3 z2 = mixbox_rgb_to_latent(color2.rgb);
mat3 z3 = mixbox_rgb_to_latent(color3.rgb);

// mix together 30% of color1, 60% of color2, and 10% of color3
mat3 z_mix = 0.3*z1 + 0.6*z2 + 0.1*z3;

vec3 rgb_mix = mixbox_latent_to_rgb(z_mix);

VisualShader

Pigment Colors

Pigment		RGB	Float RGB	Linear RGB
Cadmium Yellow		254, 236, 0	0.996, 0.925, 0.0	0.991, 0.839, 0.0
Hansa Yellow		252, 211, 0	0.988, 0.827, 0.0	0.973, 0.651, 0.0
Cadmium Orange		255, 105, 0	1.0, 0.412, 0.0	1.0, 0.141, 0.0
Cadmium Red		255, 39, 2	1.0, 0.153, 0.008	1.0, 0.02, 0.001
Quinacridone Magenta		128, 2, 46	0.502, 0.008, 0.18	0.216, 0.001, 0.027
Cobalt Violet		78, 0, 66	0.306, 0.0, 0.259	0.076, 0.0, 0.054
Ultramarine Blue		25, 0, 89	0.098, 0.0, 0.349	0.01, 0.0, 0.1
Cobalt Blue		0, 33, 133	0.0, 0.129, 0.522	0.0, 0.015, 0.235
Phthalo Blue		13, 27, 68	0.051, 0.106, 0.267	0.004, 0.011, 0.058
Phthalo Green		0, 60, 50	0.0, 0.235, 0.196	0.0, 0.045, 0.032
Permanent Green		7, 109, 22	0.027, 0.427, 0.086	0.002, 0.153, 0.008
Sap Green		107, 148, 4	0.42, 0.58, 0.016	0.147, 0.296, 0.001
Burnt Sienna		123, 72, 0	0.482, 0.282, 0.0	0.198, 0.065, 0.0