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MAC OS X > 109

FACTORS THAT AFFECT THE APPEARANCE OF PRINTS

If you wish to manually adjust the colour settings in your printer 
driver, please be aware that colour reproduction is a complex topic, 
and there are many factors to take into consideration. Some of the 
most important factors are listed below.

Neither a printer nor a monitor is capable of 
reproducing the full range of colours visible to the 
human eye. Each device is restricted to a certain range 
of colours. In addition to this, a printer cannot 
reproduce all of the colours displayed on a monitor, and 
vice versa.

Both devices use very different technologies to 
represent colour. A monitor uses Red, Green and Blue 
(RGB) phosphors (or LCDs), a printer uses Cyan, Yellow, 
Magenta and Black (CMYK) toner or ink. 

A monitor can display very vivid colours such as intense 
reds and blues and these cannot be easily produced on 
any printer using toner or ink. Similarly, there are 
certain colours, (some yellows for example), that can be 
printed, but cannot be displayed accurately on a 
monitor. This disparity between monitors and printers 
is often the main reason that printed colours do not 
match the colours displayed onscreen. 

A print can look very different under different lighting conditions. For 
example, the colours in a print may look different when viewed 
standing next to a sunlit window, compared to how they look under 
standard office fluorescent lighting.