Brother MFC-590 Owner's Manual page 124

Relative Colourimetric 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 Colourimetric 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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Using the Brother MFC with a New Power Macintosh G3, G4 or iMac /iBook