Digital BW, The Print

Good information - thanks.

> 
> Peaky spectra **IS** what causes metamerism, regardless of whether 
> you're talking about inks or paint chips or geology minerals! The 
> physics and perceptual science of metamerism is not in question.
> 
> The cones in your retina have three very broad and overlapping 
> sensitivity curves, but all three centered in the middle (430, 530, 
> 560 nm)  However real-world pigments and light sources often have 
> sharp peaks and valleys and their peaks are often higher or lower 
> than the cones' peak sensitivity.  If the reflectance spectrum of a 
> pigment and the emission spectrum of light source both have, say 
> sharp peaks at 680 nm and 540 nm the resulting color will look 
> yellow.  Shift the peak of the emission spectrum to, say, 500 nm 
and 
> the light will look only a LITTLE different to the eye, but the 
> pigment will look red.
> 
> > Does this really mean that the yellow ink goes magenta in
> > tungsten light and green in daylight?  
> 
> No one is proposing that the yellow ink changes color, and if 
you're 
> a "scientist by nature" you wouldn't ask such a question.    The 
> color you see is a result of the COMBINATION of wavelengths hitting 
> your retina.   So If you have equal amounts of red, green, and blue 
> hitting your retina you see white (or grey).    Remove (or reduce) 
> the yellow because its reflectance peak(s) don't line up with the 
> emission spectrum and the result is that cones with the middle 
> spectral sensitivity (530) nm don't receive as much stimulation so 
> your eye sees a different color.

A scientist by nature is someone that questions, wants to know how 
things work, applies logical thinking to problems and so on.  i.e. 
not someone who knows everything about color, pigments and the eye.

In my short time on this forum I've noticed you rub a lot of people 
up the wrong way during your many posts.  I think you need to relax a 
little bit and get less enjoyment out of harshly correcting people 
and knowing more than others on a particular subject.