Sounds corney. But this is colorimetrics.
Please follow.
My sketch.
WHAT is WHITE?
In DIGITAL it means 0 information. (or too much "it's got no data")
Because, ya know, its digital "negative" (censor).
Nowdays, you can ;click one click and things happen like WHITE.
But back in the days, you needed to know what WHITE meant in digital language. 0 and 1 language.
It means R=0(255), G=0(255) and B=0(255). Color is 3 dimensional.
The curve shows the amount of "cut-off" of colors of the paper.
It was only our eyes in dark that said "diiiiz isssss whaaiiiiiit" and then u print it and see in daylight to see if you're useful.
It's very hard to see 'nothing'.
hahaha.
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