Colors can be represented in a computer using an RGB color scheme, where each color is a combination of red, green, and blue components. In $24-$bit RGB$,$ each component uses $8$ bits, from a low of $(00000000{)}_2$ to a high of $(11111111{)}_2.$ This translates to a range of $0-255$ in base $10.$ The $8$ bits of red are stored first, followed by the $8$ bits of green, and finally the $8$ bits of blue.

For example, the color green has RGB values $($in base $10)$ of red $0,$ green $255,$ blue $0.$ A computer stores this as $24$ bits: $(000000001111111100000000{)}_2.$ Meanwhile, purple is a mix of red and blue: red $255,$ green $0,$ blue $255.$ This is stored in binary as $(111111110000000011111111$