The ratios have been scientifically calculated to ensure that text can be read by those with moderate low vision and that contrast is sufficient enough for those who have color.

What colour text on green background. Colour theory usually dictates that secondary colours match well with the colours that make them up. The first number describes the red color input the second the green color input and the third one the blue color input. Use the below to pick colors for background and text font.

Blue text on yellow background. Blue text is not so bad. Orange text is not so bad.

Most people who understand even a little about color know they should not use red text on a blue background Hard to read or blue text on a red background Hard to read because the normal human eye with normal lenses cannot focus on certain shades of red and blue at the same time. The black line has higher luminance contrast with the background and can be read it would be even easier to read with a brighter green. For detailed guidelines see the W3C.

Color programs will distinguish signs. So it is critical to consider adequate contrast between text and backgrounds. What I want is for the green background to be just behind the text not to be 100 of the page width.

Purple text is not so bad. In Deuterope Mode RedGreen Color. The RGB value defines HTML color by mixing red green and blue values.

The colors are simply too close together. A preview of the text and background color combination is given. Green is a secondary colour thats created by combining primary colours blue and yellow.