Color

Formal– the quality of an object or substance with respect to light reflected by the object, usually determined visually by measurement of hue, saturation, and brightness of the reflected light; saturation or chroma

Source– http://www.dictionary.com/browse/color

Informal– the original skin color

Hue

Formal–a gradation or variety of a color

Source– www.dictionary.com/browse/hue

Informal– tint

Saturation

Formal– Saturation defines a range from pure color (100%) to gray (0%) at a constant lightness level. A pure color is fully saturated.

Source– http://www.workwithcolor.com/color-properties-definitions-0101.ht

Informal– intense color of an image

Intensity

Formal– Intensity refers to the purity of a hue. Intensity is also known as Chroma or Saturation. The highest intensity or purity of a hue is the hue as it appears in the spectrum or on the color wheel.

Source– https://www.google.com/?client=safari&channel=iphone_bm#channel=iphone_bm&q=intensity+definition+colo

Informal– when a color is pure