Colour tests

Area between the lines shows contrast of 4.5 - 5 against white

In the diagram below, all of the colors to the left of the left line are over 5:1, if measured on against a white background. The colors between the lines represent what is gained between 5:1 and 4.5:1. (The colors to the left of the white section are over 4.5:1 with a white background)

contrast to white

Area between the lines has a contrast of 4.5 to 5 against black

In the diagram below, all of the colors to the right of the right line are over 5:1, if measured on against a black background. The colors between the lines represent what is gained between 5:1 and 4.5:1. (The colors to the right of the black section are greater than 4.5:1 with a black background)

contrast to black

Cut out the middle

The following section demostrates the color spectrum with the area between the lines (4.5-5) removed with the two edges pushed together.

cut out middle

Overlap of 4.5 to 5 against black and 4.5 to 5 against white

The two lines below represent the overlap. Inside these lines are colors that have a contrast of greater than 4.5:1 with both a white background and a black background. There are no colours that overlap at 5:1.

overlap colours