On Danbooru, this refers to a color gradient, which is a smooth, gradual shift from one color to another across an image, based on the position of a pixel relative to a defined point or line.

An image may still be considered [[monochrome]] if it just applies a gradient across what would otherwise be a black & white image, even if the gradient has a multitude of colors, e.g. post #61761 or post #141581.

h4.  Related tags

* [[Gradient background]]
* [[Gradient eyes]]
* [[Gradient hair]]  (e.g. [[Hijiri Byakuren]])
* [[Gradient legwear]]
* [[Gradient wings]]

h4.  See also

* [[Tag group:Colors]]
* [[Tag group:Image composition]]

h4. External links

* "Wikipedia: Color gradient":http://en.wikipedia.org/wiki/Color_gradient