Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut-away 3D models of each. Below: two-dimensional plots showing two of a model's three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case the outside surface of each cylinder; horizontal cross-sections (c, g) of constant HSL lightness or HSV value, in this case the slices halfway down each c
![HSL and HSV - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/87aec56e97ab62576f553562b64039b80441c83c/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2Fa%2Fa0%2FHsl-hsv_models.svg%2F1200px-Hsl-hsv_models.svg.png)