Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The color difference of 24-color blocks is shown on the CIE 1931 chromaticity diagram 2° standard observer. The black line connecting the center of the two points is “red” to indicate simulated colors and “green” to indicate measured colors.
