rgb与hsi的相互转换代码java

RGB与HSI的相互转换代码如下所示：

public class RGBtoHSIConverter {
    public static void main(String[] args) {
        int R = 100;
        int G = 50;
        int B = 150;
        
        double H, S, I;
        
        // RGB转HSI
        double r = R / 255.0;
        double g = G / 255.0;
        double b = B / 255.0;
        
        double min = Math.min(Math.min(r, g), b);
        double max = Math.max(Math.max(r, g), b);
        double delta = max - min;
        
        if (delta == 0) {
            H = 0;
        } else if (max == r) {
            H = (60 * ((g - b) / delta) + 360) % 360;
        } else if (max == g) {
            H = (60 * ((b - r) / delta) + 120) % 360;
        } else {
            H = (60 * ((r - g) / delta) + 240) % 360;
        }
        
        if (max == 0) {
            S = 0;
        } else {
            S = 1 - min / max;
        }
        
        I = (r + g + b) / 3;
        
        System.out.println("HSI: (" + H + ", " + S + ", " + I + ")");
        
        // HSI转RGB
        double r2, g2, b2;
        
        if (H < 120) {
            b2 = I * (1 - S);
            r2 = I * (1 + (S * Math.cos(Math.toRadians(H)) / Math.cos(Math.toRadians(60 - H))));
            g2 = 3 * I - (r2 + b2);
        } else if (H < 240) {
            H = H - 120;
            r2 = I * (1 - S);
            g2 = I * (1 + (S * Math.cos(Math.toRadians(H)) / Math.cos(Math.toRadians(60 - H))));
            b2 = 3 * I - (r2 + g2);
        } else {
            H = H - 240;
            g2 = I * (1 - S);
            b2 = I * (1 + (S * Math.cos(Math.toRadians(H)) / Math.cos(Math.toRadians(60 - H))));
            r2 = 3 * I - (g2 + b2);
        }
        
        int R2 = (int) (r2 * 255);
        int G2 = (int) (g2 * 255);
        int B2 = (int) (b2 * 255);
        
        System.out.println("RGB: (" + R2 + ", " + G2 + ", " + B2 + ")");
    }
}