c语言比例法颜色,颜色空间RGB与 色调、饱和度、亮度(ESL)转换的完整C语言算法...

以下是C语言中实现颜色比例法、RGB与ESL转换的完整算法：

颜色比例法：

#include <stdio.h>

int main() {
    float r, g, b;
    printf("Enter RGB values (0-255): ");
    scanf("%f %f %f", &r, &g, &b);
    
    // normalize the RGB values
    r /= 255;
    g /= 255;
    b /= 255;
    
    // calculate the maximum RGB value
    float cmax = (r > g) ? r : g;
    if (b > cmax) {
        cmax = b;
    }
    
    // calculate the minimum RGB value
    float cmin = (r < g) ? r : g;
    if (b < cmin) {
        cmin = b;
    }
    
    // calculate the difference between max and min
    float diff = cmax - cmin;
    
    // calculate hue
    float hue = 0;
    if (diff == 0) {
        hue = 0;
    } else if (cmax == r) {
        hue = (60 * ((g - b) / diff) + 360) % 360;
    } else if (cmax == g) {
        hue = (60 * ((b - r) / diff) + 120) % 360;
    } else if (cmax == b) {
        hue = (60 * ((r - g) / diff) + 240) % 360;
    }
    
    // calculate saturation
    float saturation = (cmax == 0) ? 0 : (diff / cmax) * 100;
    
    // calculate lightness
    float lightness = (cmax + cmin) / 2 * 100;
    
    printf("HSL values: %.2f %.2f %.2f\n", hue, saturation, lightness);
    
    return 0;
}

RGB与ESL转换：

#include <stdio.h>

int main() {
    float r, g, b;
    printf("Enter RGB values (0-255): ");
    scanf("%f %f %f", &r, &g, &b);
    
    // normalize the RGB values
    r /= 255;
    g /= 255;
    b /= 255;
    
    // calculate the maximum RGB value
    float cmax = (r > g) ? r : g;
    if (b > cmax) {
        cmax = b;
    }
    
    // calculate the minimum RGB value
    float cmin = (r < g) ? r : g;
    if (b < cmin) {
        cmin = b;
    }
    
    // calculate the difference between max and min
    float diff = cmax - cmin;
    
    // calculate hue
    float hue = 0;
    if (diff == 0) {
        hue = 0;
    } else if (cmax == r) {
        hue = (60 * ((g - b) / diff) + 360) % 360;
    } else if (cmax == g) {
        hue = (60 * ((b - r) / diff) + 120) % 360;
    } else if (cmax == b) {
        hue = (60 * ((r - g) / diff) + 240) % 360;
    }
    
    // calculate saturation
    float saturation = (cmax == 0) ? 0 : (diff / cmax) * 100;
    
    // calculate lightness
    float lightness = (cmax + cmin) / 2 * 100;
    
    // convert to ESL
    float hue_prime = hue / 60;
    float chroma = (1 - fabs(2 * lightness - 1)) * saturation;
    float x = chroma * (1 - fabs(fmod(hue_prime, 2) - 1));
    float m = lightness - chroma / 2;
    
    // convert to RGB
    float r1, g1, b1;
    if (hue < 60) {
        r1 = chroma;
        g1 = x;
        b1 = 0;
    } else if (hue < 120) {
        r1 = x;
        g1 = chroma;
        b1 = 0;
    } else if (hue < 180) {
        r1 = 0;
        g1 = chroma;
        b1 = x;
    } else if (hue < 240) {
        r1 = 0;
        g1 = x;
        b1 = chroma;
    } else if (hue < 300) {
        r1 = x;
        g1 = 0;
        b1 = chroma;
    } else {
        r1 = chroma;
        g1 = 0;
        b1 = x;
    }
    
    r1 += m;
    g1 += m;
    b1 += m;
    
    // convert to 0-255 range
    int r2 = r1 * 255;
    int g2 = g1 * 255;
    int b2 = b1 * 255;
    
    printf("ESL values: %.2f %.2f %.2f\n", hue_prime, chroma, m);
    printf("RGB values: %d %d %d\n", r2, g2, b2);
    
    return 0;
}