XYZ to RGB debug

[ChenJash]

Thank you for your code. I use C++to process colors temporarily, and these codes have provided me with some convenience.

An error was found in the XYZ_to_RGB.hpp

There is an error in the calculation order of converting linear rgb to srgb in line 19. The correct order is:

std:: pow (linear srgb color (i), 1.0/2.4) * 1.055-0.055

Perhaps you can verify and fix this issue.

[yuki-koyama]

Thanks for pointing this out! It seems that my equation was wrong. I am not sure why it passed the test (

color-util/tests/conversions/main.cpp

Line 43 in 8db4b1d

if ((delta = (rgb_color - colorutil::convert_XYZ_to_RGB(xyz_color)).norm()) > 1e-5)

), but anyway the equation should definitely be fixed.