Scanning the Original
If, for example, the original document consisted of three sections, one coloured yellow, one magenta, and one cyan, as shown at left, how would the copier perform colour separation (scanning) on it?
The diagram at left illustrates the relationship between the three primary colours of light (blue, green, and red) and the three primary colours of pigment (yellow, magenta, and cyan).
Mixing the two colours on either side of any of the colours produces the colour in between. In other words, the three primary colours of pigment (yellow, magenta, and cyan) are sufficient to perform colour separation into the three primary colours of light adjacent to them as well. Using this relationship, first the scanner scans colours of original document as light data, then converts them as colour data to transfer to the print section.
• The yellow portion of the original
When white light is shined on the yellow portion of the original, the yellow pigment absorbs blue light while reflecting green and red light. The reflected green and red light is absorbed by the blue filter and passes through the green and red filters.
The colour separation process yields green and red, resulting in yellow.
• The magenta portion of the original
When white light is shined on the magenta portion of the original, the magenta pigment absorbs green light while reflecting blue and red light. The reflected blue and red light is absorbed by the green filter and passes through the blue and red filters.
The colour separation process yields blue and red, resulting in magenta.
• The cyan portion of the original
When white light is shined on the cyan portion of the original, the cyan pigment absorbs red light while reflecting blue and green light. The reflected blue and green light is absorbed by the red filter and passes through the blue and green filters.
The colour separation process yields blue and green, resulting in cyan.


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