Mixbox项目：基于物理的颜料混合算法实现指南

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Mixbox项目：基于物理的颜料混合算法实现指南

mixbox Mixbox is a library for natural color mixing based on real pigments. 项目地址: https://gitcode.com/gh_mirrors/mi/mixbox

项目概述

Mixbox是一个创新的颜色混合库，它通过模拟真实世界中的颜料混合行为，解决了传统RGB颜色空间混合时出现的色彩灰暗、饱和度不足等问题。该项目基于物理颜料的光学特性研究，实现了更接近真实绘画效果的色彩混合算法。

基础使用：两种颜色混合

Mixbox提供了简单的API来实现两种颜色的混合。下面是一个完整的示例代码：

#include <stdio.h>
#include "mixbox.h"

int main() {
  // 定义两种颜色：蓝色和黄色
  unsigned char r1 =   0, g1 = 33,  b1 = 133; 
  unsigned char r2 = 252, g2 = 211, b2 = 0;   
  
  float t = 0.5;  // 混合比例
  unsigned char r, g, b;  // 结果颜色

  // 调用混合函数
  mixbox_lerp(r1, g1, b1,  // 第一种颜色
              r2, g2, b2,  // 第二种颜色
              t,           // 混合比例(0-1之间)
              &r, &g, &b); // 结果输出

  printf("混合结果: %d %d %d\n", r, g, b);
}

在这个例子中，我们混合了蓝色(RGB: 0,33,133)和黄色(RGB: 252,211,0)，混合比例为0.5。与传统RGB插值不同，Mixbox会产生更接近真实颜料混合的效果。

进阶功能：多种颜色混合

Mixbox还支持多种颜色的加权混合，这是通过将RGB颜色转换为潜在空间(latent space)表示来实现的：

// 定义三种颜色
unsigned char r1 = 255, g1 = 0, b1 = 0;   // 红色
unsigned char r2 = 0, g2 = 255, b2 = 0;   // 绿色
unsigned char r3 = 0, g3 = 0, b3 = 255;   // 蓝色

mixbox_latent z1, z2, z3, z_mix;

// 将RGB颜色转换为潜在空间表示
mixbox_rgb_to_latent(r1, g1, b1, z1);
mixbox_rgb_to_latent(r2, g2, b2, z2);
mixbox_rgb_to_latent(r3, g3, b3, z3);

// 在潜在空间中进行加权混合
for (int i = 0; i < MIXBOX_LATENT_SIZE; i++) {
  // 混合比例：红色30%，绿色60%，蓝色10%
  z_mix[i] = 0.3f*z1[i] + 0.6f*z2[i] + 0.1f*z3[i];
}

// 将混合结果转换回RGB空间
unsigned char r, g, b;
mixbox_latent_to_rgb(z_mix, &r, &g, &b);

这种方法特别适合需要精确控制多种颜色混合比例的场景，如数字绘画软件中的调色板功能。

支持的颜料颜色参考

Mixbox内置了对多种常见颜料的精确模拟，以下是部分颜料在三种不同颜色空间中的表示：

| 颜料名称 | RGB值 | 浮点RGB | 线性RGB | |---------|-------|---------|---------| | 镉黄 | 254,236,0 | 0.996,0.925,0.0 | 0.991,0.839,0.0 | | 汉莎黄 | 252,211,0 | 0.988,0.827,0.0 | 0.973,0.651,0.0 | | 镉橙 | 255,105,0 | 1.0,0.412,0.0 | 1.0,0.141,0.0 | | 镉红 | 255,39,2 | 1.0,0.153,0.008 | 1.0,0.02,0.001 | | 喹吖啶酮洋红 | 128,2,46 | 0.502,0.008,0.18 | 0.216,0.001,0.027 | | 钴紫 | 78,0,66 | 0.306,0.0,0.259 | 0.076,0.0,0.054 | | 群青蓝 | 25,0,89 | 0.098,0.0,0.349 | 0.01,0.0,0.1 | | 钴蓝 | 0,33,133 | 0.0,0.129,0.522 | 0.0,0.015,0.235 | | 酞菁蓝 | 13,27,68 | 0.051,0.106,0.267 | 0.004,0.011,0.058 | | 酞菁绿 | 0,60,50 | 0.0,0.235,0.196 | 0.0,0.045,0.032 | | 永久绿 | 7,109,22 | 0.027,0.427,0.086 | 0.002,0.153,0.008 | | 树汁绿 | 107,148,4 | 0.42,0.58,0.016 | 0.147,0.296,0.001 | | 熟赭 | 123,72,0 | 0.482,0.282,0.0 | 0.198,0.065,0.0 |

这些颜料数据基于真实物理测量，确保了混合结果的准确性。