fix: better precision on xyz/srgb conversion #77
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When converting back and forth between XYZ and RGB colour spaces, there is some loss of precision. This is particularly noticeable with multiple conversions and when using the
.rawoutput.Currently, the library uses a precision level of 4 fractional digits for this conversion. I've updated to use the full 7 fractional digits as defined here: http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html