Olive (#808000) is a medium, highly saturated yellow hue. Olive is a dark yellowish green with military and Mediterranean associations.
In RGB it is made of 128 red, 128 green and 0 blue. Its HSL hue angle is 60° with 100% saturation and 25% lightness, while its perceptual OKLCH lightness is 58% with a chroma of 0.127. For print, a starting CMYK mix is 0% cyan, 0% magenta, 100% yellow and 50% black.
As a text color on white, Olive has a contrast ratio of 4.2:1, which passes AA only for large text and UI parts. On black it reaches 5.01:1 and passes AA for normal text. If you use Olive as a background, put black (or very dark) text on it. The APCA lightness contrast is Lc 35 for black text and Lc -74 for white text.
Its perceptual complement is #7A6CC0, close to amethyst. Colors that look most similar are caramel, sea green, forest green. It looks fairly similar to people with red-green color blindness (ΔE 2), so its meaning mostly survives.