I have used three online color space conversion calculators and I get three different sets of numbers when I convert from XYZ to RGB. Whats happening? Whos right?
It is quite likely that they are all accurate, however they all might be using slightly different definitions of RGB or assumptions on how the XYZ values were obtained. This is one problem with RGB; it is not specifically defined and is device dependent. It is probably best to just choose one converter and stick with it.