Greyscale
(Black and white continuous tone and any shade of grey, such as a black and white photograph)
In fact a `gray' color is one in which the
red, green and blue components all have equal intensity in
RGB space, and so it is only necessary to specify a single
intensity value for each pixel, as opposed to the three intensities
needed to specify each pixel in a full color image.
Often, the grayscale intensity is stored as an 8-bit integer giving
256 possible different shades of gray from black to white. If the
levels are evenly spaced then the difference between successive
graylevels is significantly better than the graylevel resolving power
of the human eye.
Spot colour
(one or more specially mixed colours as opposed as a result of a CMYK or RGB mix)
Spot colours are the preferred method of producing
stationery inexpensively. This is also the method used where colour
accuracy is also deemed essential. The standard reference guide to spot
colour work in the UK is Pantone®.
Duotone
(when a continuous tone image is printed in 2 or more spot colours – this term is also generally used when describing tri and quadtones.
'Duotone is the generic name for multitone printing, which can be
done with two, three or four inks. This process requires that the press
be set up with special inks, usually PANTONE-designated colors, instead
of the standard CMYK inks used for process color printing. Usually the
images are printed with a dark base color and a lighter second color,
overprinted to fill in, tint and tone the photo or graphic'
Mono
(like greyscale but with a coloured ink, ie: one colour and percentage tints of that colour, plus the colour of the material it’s printed on)
Monochromatic colours are all the colours of a single hue derived from one colour and extended using the shades,tones and tints of that colour.
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