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The Human Eye

HUMAN EYE on page 05.00
SENSITIVITY on page 05.01
WHITENESS on this page
COLOR-BLINDNESS on page 05.03




Lets focus on whiteness. The whiteness is the preference rating for the color of white objects. The quality or state of being white.
We call white "white", but clear-headed there are thousands shades of white.

Nevertheless there is a relationship between the brightness and the yellowness of a white color.
Add a very small amount of a blue pigment to a white pigment and the human eye appears more white.

Adding a blue pigment to a white pigment the Lightness as well as the yellowness will decrease and in addition the human eye discovers the shade as more white.

A very clear example: Detergents contain small quantities of blue or bluish-green pigment.
Because of this pigment white laundry appears to be whiter but does this really mean that the laundry is clean?

Bright as the radiating or reflecting much light or luminous or shining. Brightness as the quality of being white.
Often mentioned as clearness or vividness.



An explanation:

The Whiteness W1 consists of a certain Brightness 
B1 and a certain Yellowness Y1. 

Hence, W2 is the Whiteness that consists of a 
Brightness B2 and a Yellowness Y2.  

W1 and W2 are on the straight line of the relationship 
between the Brightness and Yellowness.

The human Eye considers W1 and W2 as an equal White Color.   


A meaning or interpretation: 

After adding a very small amount of a blue pigment
to the W1, the following will happen:

The Yellowness Y1 will decrease to Y3 and the 
Brightness will shift from B1 to B3.

Notice that W3 is not on the straight line of the relationship 
between the Brightness and the Yellowness.

To the human Eye W3 appears to be more white 
than W1 or W2.


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