SRM Color Impression Rendering with the deLange Formula

[aschet]

This is not a feature request, but I recently created an implementation of the deLange model (http://dx.doi.org/10.1016/B978-0-12-799954-8.00011-3) that can be used to color SRM values, and thought it might also be of interest to the BrewTarget community. The unique feature of this model is that it was derived from spectral analysis of 99 beers, rather than polynomial fits to the color gradients of an existing beer color guide. In addition, it formed the basis for the BJCP color guide and can also be adapted for specific beer glass widths, as the perceived color of beer darkens in wider glasses.

The implementation for several programming languages is available here: https://github.com/aschet/olfarve

[matty0ung]

Sounds good. We'll definitely take a look!