Brother DCP-4020C - Manual (Page 193)

13 - 15 USING YOUR DCP WITH A MACINTOSH
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Relative Colorimetric Matching—The colours that fall within the
gamuts of both devices are left unchanged. Some colours in both
images will be exactly the same, a useful outcome when colours
must match quantitatively. What that means is that if the colour is
inside the gamut, it will stay the same colour. However, if the colour
is outside the gamut, it will be mapped to the edge of the gamut. This
intent is best suited for logos or “spot colours” where colour must
match.
Absolute Colorimetric Matching—A close appearance match may be
achieved over most of the tonal range, but if the minimum density of
the idealized image is different from that of the output image, the
areas of the image that are left blank will be different. Colours that fall
within the gamuts of both devices are left unchanged.
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