# Delta Ch

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 Revision as of 18:19, 8 September 2015 (view source)Patrick (Talk | contribs)m (Created page with " Delta Ch is a metric of gray balance error. Delta-Ch (formerly known as Delta-F*) is an absolute (always positive) expression of the combined delta a* and delta b* values, whe...")← Previous diff Latest revision as of 18:57, 8 September 2015 (view source)Patrick (Talk | contribs) m (3 intermediate revisions not shown) Line 1: Line 1: - - Delta Ch is a metric of gray balance error. Delta Ch is a metric of gray balance error. Delta-Ch (formerly known as Delta-F*) is an absolute (always positive) expression of the combined delta a* and delta b* values, where: Delta-Ch (formerly known as Delta-F*) is an absolute (always positive) expression of the combined delta a* and delta b* values, where: - ∆Ch = (∆a2 + ∆b2)0.5 + ∆Ch = (∆a2 + ∆b2)0.5 + + Delta-Ch is the shortest line, or vector, between two points on the a*/b* graph, as shown below. + + [[File:DCH.png|center|On a CIE a*/b* diagram ∆Ch is a straight vector between two samples.]] + + The original name for Delta-Ch was “∆F*”, where the letter F stood for the German word for color – “Farbe”. Both terms mean the same thing and may appear in various literature. + + ∆Ch is an excellent metric of gray balance or “nearness to neutral” because color errors are more noticeable than lightness errors in grays or near-neutrals. + + + http://www.hutchcolor.com/PDF/CurveGuide.pdf + + + + + [[Category:Glossary]]

## Latest revision as of 18:57, 8 September 2015

Delta Ch is a metric of gray balance error.

Delta-Ch (formerly known as Delta-F*) is an absolute (always positive) expression of the combined delta a* and delta b* values, where:

∆Ch = (∆a2 + ∆b2)0.5

Delta-Ch is the shortest line, or vector, between two points on the a*/b* graph, as shown below.

The original name for Delta-Ch was “∆F*”, where the letter F stood for the German word for color – “Farbe”. Both terms mean the same thing and may appear in various literature.

∆Ch is an excellent metric of gray balance or “nearness to neutral” because color errors are more noticeable than lightness errors in grays or near-neutrals.