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==Multiband
Colour 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 colour. Therefore, the [[HSL and HSV]] colour 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]] colour model [[#Pham2007|(Pham et al., 2007)]].
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