It shouldn’t matter in the range of colors, where our eyes are the most sensitive, but even for people with so-called 20/20 vision, color sensitivity varies from color to color and from person to person, depending on various factors:
Right, I didn’t disagree but can we both agree you’re talking about photoreceptors in the eye and the neurological links in the brain? And the S/M/L cones in particular? All cones are sensitive to all colours, which is probably why we can’t see the same dynamic range that a 16-bit digital colour sensor can which is receptive to only one type of colour. Anyway most variating in how we percieve colour is due to people having a different ratio of L-type to M-type cones in the eye, which is believed to vary greatly, but I don’t see how it would affect someone with 20/20 vision to match two colour sources accurately with the right tools and methods.
For this thread I’m after the print color, as the lamp color and cinema screens are not a constant factor (for example lamps will emit a slightly different color when they age, and cinema screens exist in varrying quality), and their effect fairly minimal as I’ve shown in the above example. Additionally these are relatively easy to correct for.
Sure, carbon arc lamps age greatly, and if you run a twin-projector set up with two lamps that aren’t the same age or don’t recieve equal wear because you run them with a bias towards one projector then you can end up with the picture looking different on one.
print + led + CCD sensor => print color (under white light) + led color + sensor response curve
How about this?
print (variable) + led (variable) + CCD sensor (variable) => …
There is cross-contamination across the Cyan/Magenta/Yellow dyes, because just like the photoreceptors in our eyes the pixel sensitivity in the CCD, the dyes are not completely transparent to wavelengths outside of their main “colour”.
Mike Verta photograph (with 1970s carbon-arc lamp & 1970s cinema screen):
DrDre scan (with 2017 LED light & 2017 CCD-sensor & calibration):
Now unless someone can point out some glaring color differences, I rest my case…
I can bring that a bit closer to Mike’s photo, it’s still not 100% though (I lack the expertise or proper tools):
