css saturate
/* syntax: The amount of the conversion, specified as a <number> or a <percentage>. A value under 100% desaturates the image, while a value over 100% super-saturates it. A value of 0% is completely unsaturated, while a value of 100% leaves the input unchanged. The lacuna value for interpolation is 1. */ saturate(amount) /* examples */ filter: saturate(1); filter: saturate(2); filter: saturate(50%);