Editing Contrast ratio (section)

== Methods of measurement ==

Many display devices favor the use of the ''full on/full off'' method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both measurements proportionally, leaving the black-to-white luminance ratio unaffected.

Some manufacturers have gone as far as using different device parameters for the three tests, even further inflating the calculated contrast ratio. With [[Digital Light Processing|DLP]] projectors, one method to do this is to enable the clear sector of the color filter wheel for the ''"on"'' part and disable it for the ''"off"'' part<ref name=practical>''www.practical-home-theater-guide.com''. [http://www.practical-home-theater-guide.com/contrast-ratio.html Extensive coverage of practical contrast ratio]</ref>  This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content.

Another measure is the ''[[ANSI]] contrast'', in which the measurement is done with a checker board patterned test image where the black and white luminosity values are measured simultaneously.<ref>[http://carltonbale.com/the-truth-about-inflated-hdtv-contrast-ratios The Truth About Inflated HDTV Contrast Ratios]. August 27, 2007.</ref>  This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.

It is useful to note that the ''full on/full off'' method effectively measures the dynamic contrast ratio of a display, while the ''ANSI contrast'' measures the static contrast ratio.