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2026-03-19 22:49:41 +01:00 · 2022-09-21 05:09:53 +02:00
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-# Mixbox: Practical Pigment Mixing for Digital Painting
+# Mixbox: Pigment-Based Color Mixing

 <p align="center">
  <img src="https://scrtwpns.com/mixbox/teaser.jpg"/>
 </p>

-Mixbox is a pigment mixing black-box. You pass RGB colors in and get the mixed RGB out.
-Internally, Mixbox treats the colors as if they were made of actual real-world pigments.
-It uses the Kubelka & Munk theory to predict the color of the resulting mixture.
-This way, Mixbox achieves that blue and yellow mix to green, the same way real pigments do.
+Mixbox is a new blending method for natural color mixing. It produces saturated gradients with hue shifts and natural secondary colors during blending. Yellow and blue make green. The interface is simple - RGB in, RGB out. Internally, Mixbox treats colors as real-life pigments using the Kubelka & Munk theory to predict realistic color behavior. That way, colors act like actual paints and bring more vibrance and intuition into digital painting.

 * Paper: https://scrtwpns.com/mixbox.pdf<br>
 * Video: https://youtu.be/ATzVPVNp1qA<br>
 * Talk: https://youtu.be/_qa5iWdfNKg<br>
 * Demo: https://scrtwpns.com/mixbox/painter<br>

-Mixbox is shipping in Rebelle 5 Pro as the [Rebelle Pigments](https://www.escapemotions.com/products/rebelle/about) feature.
+Mixbox is shipping in Rebelle 5 Pro as the [Rebelle Pigments](https://www.escapemotions.com/products/rebelle/about) feature and in the [Flip Fluids](https://flipfluids.com/) addon for Blender.

 ## Usage
-The simplest way to use Mixbox is with the *lerp* interface:
+- [C / C++](cpp): `#include "mixbox.h"` and build `mixbox.cpp` together with your project
+- [C#](csharp): use Mixbox package from NuGet `https://www.nuget.org/packages/Mixbox/2.0.0`
+- [Java](java): add `implementation 'com.scrtwpns:mixbox:2.0.0'` to your Gradle
+- [JavaScript](javascript): `<script src="https://scrtwpns.com/mixbox.js">`
+- [Node](javascript): `npm install mixbox`
+- [Python](python): `pip install pymixbox`
+- [Rust](rust): add `mixbox = "2.0.0"` to your Cargo.toml
+- [Unity](unity): add package from git url `git://github.com/scrtwpns/mixbox.git#upm`
+- [Godot](godot): copy `godot\addons` to the root of your project
+- [Shaders](shaders): load `mixbox_lut.png` as texture and paste the Mixbox `.glsl`/`.hlsl` code into your shader
+
+## Pigment Colors
+| Pigment |  | RGB | Float RGB | Linear RGB |
+| --- | --- |:----:|:----:|:----:|
+| Cadmium Yellow | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_yellow.png"/> | 254, 236, 0  | 0.996, 0.925, 0.0 | 0.991, 0.839, 0.0 |
+| Hansa Yellow | <img src="https://scrtwpns.com/mixbox/pigments/hansa_yellow.png"/> | 252, 211, 0  | 0.988, 0.827, 0.0 | 0.973, 0.651, 0.0 |
+| Cadmium Orange | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_orange.png"/> | 255, 105, 0  | 1.0, 0.412, 0.0 | 1.0, 0.141, 0.0 |
+| Cadmium Red | <img src="https://scrtwpns.com/mixbox/pigments/cadmium_red.png"/> | 255, 39, 2  | 1.0, 0.153, 0.008 | 1.0, 0.02, 0.001 |
+| Quinacridone Magenta | <img src="https://scrtwpns.com/mixbox/pigments/quinacridone_magenta.png"/> | 128, 2, 46  | 0.502, 0.008, 0.18 | 0.216, 0.001, 0.027 |
+| Cobalt Violet | <img src="https://scrtwpns.com/mixbox/pigments/cobalt_violet.png"/> | 78, 0, 66  | 0.306, 0.0, 0.259 | 0.076, 0.0, 0.054 |
+| Ultramarine Blue | <img src="https://scrtwpns.com/mixbox/pigments/ultramarine_blue.png"/> | 25, 0, 89  | 0.098, 0.0, 0.349 | 0.01, 0.0, 0.1 |
+| Cobalt Blue | <img src="https://scrtwpns.com/mixbox/pigments/cobalt_blue.png"/> | 0, 33, 133  | 0.0, 0.129, 0.522 | 0.0, 0.015, 0.235 |
+| Phthalo Blue | <img src="https://scrtwpns.com/mixbox/pigments/phthalo_blue.png"/> | 13, 27, 68  | 0.051, 0.106, 0.267 | 0.004, 0.011, 0.058 |
+| Phthalo Green | <img src="https://scrtwpns.com/mixbox/pigments/phthalo_green.png"/> | 0, 60, 50  | 0.0, 0.235, 0.196 | 0.0, 0.045, 0.032 |
+| Permanent Green | <img src="https://scrtwpns.com/mixbox/pigments/permanent_green.png"/> | 7, 109, 22  | 0.027, 0.427, 0.086 | 0.002, 0.153, 0.008 |
+| Sap Green | <img src="https://scrtwpns.com/mixbox/pigments/sap_green.png"/> | 107, 148, 4  | 0.42, 0.58, 0.016 | 0.147, 0.296, 0.001 |
+| Burnt Sienna | <img src="https://scrtwpns.com/mixbox/pigments/burnt_sienna.png"/> | 123, 72, 0  | 0.482, 0.282, 0.0 | 0.198, 0.065, 0.0 |
+
+## C / C++
 ```c++
 #include <stdio.h>
 #include "mixbox.h"

-int main()
-{
-  unsigned char r1=252, g1=211, b1=0;  // bright yellow
-  unsigned char r2=0,   g2=0,   b2=96; // deep blue
+int main() {
+  unsigned char r1 =   0, g1 = 33,  b1 = 133; // blue
+  unsigned char r2 = 252, g2 = 211, b2 = 0;   // yellow
  float t = 0.5;
  unsigned char r, g, b;

-  mixbox_lerp_srgb8(r1,g1,b1,   // first color
+  mixbox_lerp(r1, g1, b1,  // first color
              r2, g2, b2,  // second color
              t,           // mixing ratio
              &r, &g, &b); // result
@@ -37,31 +61,310 @@ int main()
  printf("%d %d %d\n", r, g, b);
 }
 ```
-Alternatively, one can use the *latent* interface. This allows mixing multiple RGB colors at once using arbitrary weights:

-```c++
-float latent1[MIXBOX_NUMLATENTS];
-float latent2[MIXBOX_NUMLATENTS];
-float latentMix[MIXBOX_NUMLATENTS];
+## GLSL Shader
+```glsl
+#ifdef GL_ES
+precision highp float;
+#endif

-mixbox_srgb8_to_latent(r1,g1,b1,latent1);
-mixbox_srgb8_to_latent(r2,g2,b2,latent2);
+uniform sampler2D mixbox_lut; // bind the "mixbox_lut.png" texture here

-for(int i=0;i<MIXBOX_NUMLATENTS;i++)
+#include "mixbox.glsl" // paste the contents of mixbox.glsl here
+
+void main(void) {
+  vec3 rgb1 = vec3(0, 0.129, 0.522); // blue
+  vec3 rgb2 = vec3(0.988, 0.827, 0); // yellow
+  float t = 0.5;                     // mixing ratio
+
+  vec3 rgb = mixbox_lerp(rgb1, rgb2, t);
+
+  gl_FragColor = vec4(rgb, 1.0);
+}
+```
+
+## Rust
+```rust
+fn main() {
+    let rgb1 = [0, 33, 133];  // blue
+    let rgb2 = [252, 211, 0]; // yellow
+    let t = 0.5;              // mixing ratio
+
+    let [r, g, b] = mixbox::lerp(&rgb1, &rgb2, t);
+
+    println!("{} {} {}", r, g, b);
+}
+```
+
+## Python
+```python
+import mixbox
+
+rgb1 = (0, 33, 133)  # blue
+rgb2 = (252, 211, 0) # yellow
+t = 0.5              # mixing ratio
+
+rgb_mix = mixbox.lerp(rgb1, rgb2, t)
+
+print(rgb_mix)
+```
+
+## JavaScript
+```html
+<html>
+  <body>
+    <script src="https://scrtwpns.com/mixbox.js"></script>
+    <script>
+      var rgb1 = "rgb(0, 33, 133)";  // blue
+      var rgb2 = "rgb(252, 211, 0)"; // yellow
+      var t = 0.5;                   // mixing ratio
+
+      var mixed  = mixbox.lerp(rgb1, rgb2, t);
+
+      document.body.style.background = mixed;
+    </script>
+  </body>
+</html>
+```
+## Node
+```javascript
+import mixbox from 'mixbox';
+
+let rgb1 = "rgb(0, 33, 133)";  // blue
+let rgb2 = "rgb(252, 211, 0)"; // yellow
+let t = 0.5;                   // mixing ratio
+
+let mixed  = mixbox.lerp(rgb1, rgb2, t);
+
+console.log(mixed);
+```
+
+## Java
+```java
+import java.awt.Color;
+import com.scrtwpns.Mixbox;
+
+class HelloMixbox {
+  public static void main(String[] args) {
+    Color color1 = new Color(0, 33, 133);  // blue
+    Color color2 = new Color(252, 211, 0); // yellow
+    float t = 0.5f;                        // mixing ratio
+
+    Color colorMix = new Color(Mixbox.lerp(color1.getRGB(), color2.getRGB(), t));
+
+    System.out.print(colorMix);
+  }
+}
+```
+
+## Android
+```java
+package com.example.hellomixbox;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.View;
+import android.graphics.Color;
+
+import com.scrtwpns.Mixbox;
+
+public class MainActivity extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        int color1 = Color.rgb(0, 33, 133);  // blue
+        int color2 = Color.rgb(252, 211, 0); // yellow
+        float t = 0.5f;                      // mixing ratio
+
+        int colorMix = Mixbox.lerp(color1, color2, t);
+
+        View view = new View(this);
+        view.setBackgroundColor(colorMix);
+        setContentView(view);
+    }
+}
+```
+
+## C#
+```csharp
+using System.Drawing;
+using Scrtwpns.Mixbox;
+
+public class HelloMixbox
 {
-  latentMix[i] = (1.0f-t)*latent1[i] + t*latent2[i]; 
+    public static void Main(string[] args)
+    {
+        Color color1 = Color.FromArgb(0, 33, 133);  // blue
+        Color color2 = Color.FromArgb(252, 211, 0); // yellow
+        float t = 0.5f;                             // mixing ratio
+
+        Color colorMix = Color.FromArgb(Mixbox.Lerp(color1.ToArgb(), color2.ToArgb(), t));
+
+        System.Console.WriteLine(colorMix);
+    }
+}
+```
+
+## Unity
+```csharp
+using UnityEngine;
+using Scrtwpns.Mixbox;
+
+public class NewBehaviourScript : MonoBehaviour
+{
+    void Start()
+    {
+        Color color1 = new Color(0.0f, 0.129f, 0.522f); // blue
+        Color color2 = new Color(0.988f, 0.827f, 0.0f); // yellow
+        float t = 0.5f;                                 // mixing ratio
+
+        Color colorMix = Mixbox.Lerp(color1, color2, t);
+
+        Debug.Log(colorMix);
+    }
+}
+```
+
+## Unity Shader
+```ShaderLab
+Shader "MixboxHelloShader"
+{
+    Properties
+    {
+        _MixboxLUT ("Mixbox LUT", 2D) = "white" {} // assign "Packages/Mixbox/Textures/MixboxLUT.png"
+
+        _Color1 ("Color 1", Color) = (0, 0.129, 0.522, 1) // blue
+        _Color2 ("Color 2", Color) = (0.988, 0.827, 0, 1) // yellow
+    }
+    SubShader
+    {
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            sampler2D _MixboxLUT;
+            #include "Packages/com.scrtwpns.mixbox/ShaderLibrary/Mixbox.cginc"
+
+            fixed4 _Color1;
+            fixed4 _Color2;
+
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
            }

-mixbox_latent_to_srgb8(latentMix,&r,&g,&b);  
+            fixed4 frag (v2f i) : SV_Target
+            {
+                fixed4 mixedColor = MixboxLerp(_Color1, _Color2, i.uv.x);
+                return mixedColor;
+            }
+            ENDCG
+        }
+    }
+}
 ```
-## Demo
+
+## Unity Shader Graph
+<p align="center">
+  <img src="https://scrtwpns.com/mixbox/unity/shadergraph_.png"/>
+</p>
+
+## Godot
+```gdscript
+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)
+```
+
+## Godot Shader
+```glsl
+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 "addons/mixbox/mixbox.gdshaderinc"
+
+void fragment() {
+    COLOR = mixbox_lerp(color1, color2, UV.x);
+}
+```
+
+## Godot VisualShader
+<p align="center">
+  <img src="https://scrtwpns.com/mixbox/godot/visualshader_.png"/>
+</p>
+
+## WebGL
+```html
+<script src="https://scrtwpns.com/mixbox.js"></script>
+```
+```javascript
+var shader = `
+  precision highp float;
+
+  uniform sampler2D mixbox_lut; // bind mixbox.lutTexture(gl) here
+
+  #include "mixbox.glsl"
+
+  void main(void) {
+    vec3 rgb1 = vec3(0, 0.129, 0.522); // blue
+    vec3 rgb2 = vec3(0.988, 0.827, 0); // yellow
+    float t = 0.5;                     // mixing ratio
+
+    vec3 rgb = mixbox_lerp(rgb1, rgb2, t);
+
+    gl_FragColor = vec4(rgb, 1.0);
+  }
+`;
+
+shader = shader.replace('#include "mixbox.glsl"', mixbox.glsl());
+```
+```javascript
+gl.useProgram(shaderProgram);
+gl.activeTexture(gl.TEXTURE0);
+gl.bindTexture(gl.TEXTURE_2D, mixbox.lutTexture(gl));
+gl.uniform1i(gl.getUniformLocation(shaderProgram, "mixbox_lut"), 0);
+```
+
+## Examples
+
+| Gradients | Mountains | Palette Snakes |
+|:---:|:---:|:---:|
+| <a href="https://scrtwpns.com/mixbox/examples/gradients.html"><img src="https://scrtwpns.com/mixbox/examples/gradients.png"/></a> | <a href="https://scrtwpns.com/mixbox/examples/mountains.html"><img src="https://scrtwpns.com/mixbox/examples/mountains.png"/></a> | <a href="https://scrtwpns.com/mixbox/examples/palette.html"><img src="https://scrtwpns.com/mixbox/examples/palette.png"/></a> |
+|  [source code](javascript/examples/gradients.js) |  [source code](javascript/examples/mountains.js) |  [source code](javascript/examples/palette.js) |
+
+| Splash Art | Paint Mixer | Pigment Fluids |
+|:---:|:---:|:---:|
+| <a href="https://scrtwpns.com/mixbox/examples/splash.html"><img src="https://scrtwpns.com/mixbox/examples/splash.png"/></a> | <a href="https://scrtwpns.com/mixbox/examples/mixer.html"><img src="https://scrtwpns.com/mixbox/examples/mixer.png"/></a> | <a href="https://scrtwpns.com/mixbox/fluids"><img src="https://scrtwpns.com/mixbox/examples/fluids.png"/></a> |
+|  [source code](javascript/examples/splash.html) |  [source code](javascript/examples/mixer.js) |  [source code](https://scrtwpns.com/mixbox/fluids/script.js) |
+
+## Painter
 <p align="center">
  <a href="https://scrtwpns.com/mixbox/painter"><img src="https://scrtwpns.com/mixbox/painter_git.jpg"/></a>
 </p>
-This is a toy painting app with soft round brush and a smudge tool. It runs two color mixing implementations in parallel: one based on Mixbox and the other that performs ordinary RGB mixing. The app allows switching between them on the fly, showing the differences between pigment-based mixing and the normal RGB mixing. To launch the demo in your browser, please <a href="https://scrtwpns.com/mixbox/painter">click here</a>.
+This painting app runs two color mixing implementations in parallel: one based on Mixbox and the other that performs ordinary RGB mixing. The app allows switching between them on the fly, showing the differences between pigment-based mixing and the normal RGB mixing. To launch the painter in your browser, please <a href="https://scrtwpns.com/mixbox/painter">click here</a>.

 ## License
 Copyright (c) 2022, Secret Weapons. All rights reserved.<br>
-This code is for non-commercial use only. It is provided for research and evaluation purposes.<br>
-If you wish to obtain commercial license, please contact: mixbox@scrtwpns.com
-
+Mixbox is provided under the CC BY-NC 4.0 license for non-commercial use only.<br>
+If you want to obtain commercial license, please contact: mixbox@scrtwpns.com