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=== Multi-band images ===
Color images can also be thresholded. One approach is to designate a separate threshold for each of the [[RGB color model|RGB]] components of the image and then combine them with an [[Binary and|AND]] operation. This reflects the way the camera works and how the data is stored in the computer, but it does not correspond to the way that people recognize color. Therefore, the [[HSL and HSV]] color models are more often used; note that since [[hue]] is a circular quantity it requires [[circular thresholding]]. It is also possible to use the [[CMYK color model|CMYK]] color model.<ref>{{Cite journal |last1=Pham |first1=Nhu-An |last2=Morrison |first2=Andrew |last3=Schwock |first3=Joerg |last4=Aviel-Ronen |first4=Sarit |last5=Iakovlev |first5=Vladimir |last6=Tsao |first6=Ming-Sound |last7=Ho |first7=James |last8=Hedley |first8=David W. |date=2007-02-27 |title=Quantitative image analysis of immunohistochemical stains using a CMYK color model
=== Multiple thresholds ===
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