[メモ] sRGB から リニアRGBに変換

• C#

式に問題があったので修正しました

- return Math.Pow((c_srgb + a / 1 + a ), 2.4 );
+ return Math.Pow(((c_srgb + a) / (1 + a) ), 2.4 );

using System;
using System.Collections.Generic;
using System.Linq;


public class App {
    
    public static void Main(string[] args) {
        int[] rgb = { 1, 1, 1};
        double[] linearrgb = Array.ConvertAll(rgb,LinerRgb);
        Array.ForEach(linearrgb, Console.WriteLine);
    }
    
    private static double LinerRgb(int c) {
        double c_srgb = (double)c / 255;
        double a = 0.055;
        
        if ( c_srgb <= 0.04045 ) return  c_srgb / 12.92;
        return Math.Pow(((c_srgb + a) / (1 + a) ), 2.4 );
    }
}

• python

def linearrgbg(c):
	c_srgb = c / 255
	a = 0.0555
	
	if c_srgb <= 0.4045:
		return c_srgb / 12.92
	return math.pow(((c_srgb + a) / (1 + a) ), 2.4 )
	
if __name__ == '__main__':
	rgb = [1,1,1]
	linearrgbg = list(map(linearrgbg, rgb))
	print(linearrgbg)

参考: sRGB - Wikipedia