Luminance Contrast
The "luminance contrast" is the ratio between the higher luminance, LH, and the lower luminance, LL, that define the feature to be detected. This ratio, often called contrast ratio, CR, (actually being a luminance ratio), is often used for high luminances and for specification of the contrast of electronic visual display devices. The luminance contrast (ratio), CR, is a dimensionless number, often indicated by adding ":1" to the value of the quotient (e.g. CR = 900:1).
with 1 ≤ CR ≤
A "contrast ratio" of CR = 1 means no contrast.
The contrast can also be specified by the contrast modulation (or Michelson contrast), CM, defined as:
with 0 ≤ CM ≤ 1.
CM = 0 means no contrast.
Another contrast definition sometimes found in the electronic displays field, K, is:
with 0 ≤ K ≤ 1.
K = 0 means no contrast, the maximum possible contrast, Kmax equals one.
Read more about this topic: Display Contrast
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