hi michael, as you said, if you took photos of the jigs and then converted them to black and white, then that might give you an idea about the differences in appaeance. However I am afraid I am not a photoshop expert so I am not sure really sure how to explain hue, saturation etc.
Maybe this will help:
[url="http://en.wikipedia.org/wiki/Hue"]http://en.wikipedia.org/wiki/Hue[/url]
[url="http://en.wikipedia.org/wiki/Saturation_(color_theory)"]http://en.wikipedia.org/wiki/Saturation_(color_theory)[/url]
[url="http://en.wikipedia.org/wiki/Lightness_(color)"]http://en.wikipedia.org/wiki/Lightness_(color)[/url]
Maybe this will help:
[url="http://en.wikipedia.org/wiki/Hue"]http://en.wikipedia.org/wiki/Hue[/url]
[url="http://en.wikipedia.org/wiki/Saturation_(color_theory)"]http://en.wikipedia.org/wiki/Saturation_(color_theory)[/url]
[url="http://en.wikipedia.org/wiki/Lightness_(color)"]http://en.wikipedia.org/wiki/Lightness_(color)[/url]