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Glossary of terms

This is a rare effect where the colour of an ink on paper changes it's appearance when viewed at different angles, often taking a metallic hue.
This effect is often confused with gloss differential (see below).


Continuous Ink system. An adaptation made to a desktop printer allowing a continuous feed of ink to be supplied to the print heads without using disposable ink cartridges. Despite high initial costs, this can deliver significant cost savings for heavy users of desktop inkjet printers.


Colour Management System.


This is the definition of how an image file's data should be represented in colour by any software handling the file.
There are three commonly used colourspaces; ProPhoto RGB, AdobeRGB and sRGB.


Custom profile
A profile created specific to one particular device. Eg a printer, camera, monitor or scanner.


The range of values that a given device can display. A wide gamut will display a greater range of colours, a narrow gamut has fewer possible values. If a device is unable to accurately reproduce a specific colour or tone, that colour, or range of colours, is said to be "out of gamut".


Gloss differential
A problem with certain types of ink and certain types of paper. The ink sits on the surface of the paper and has a different reflectivity to the paper, so has a duller finish. This primarily affects pigment inks on gloss papers.


International colour consortium. Also used as the file suffix to denote a colour profile.


Also used as the file suffix to denote a colour profile, usually in a Mac system.


With inkjet prints, this generally refers to an effect where tones appear to change colour in different lighting conditions. Mostly noticeable with black and white prints made with coloured inksets, some tones that appear neutral when viewed under one light source will show a colour cast when viewed in a different light, e.g. daylight to tungsten light.


This is a file that converts colour values in an image file to correct for the characteristics of a device handling the file. These files usually have the suffix .icm or .icc and are kept in a special folder on the computer.


When an image is either printed out to check its quality, known as hard proofing; or when previewed on a monitor to simulate its final output, known as soft proofing.


Rendering intent
This option controls how colours that can't be printed (are out of gamut) are converted to colours than can be printed.

The two most widely used rendering intents for photographic images are Relative(colormetric) and Perceptual.
Relative is best for images that entirely fall within the printer's gamut and perceptual is best for dealing with images that contain some out of gamut colours.


A device that accurately measures colour, either by transmission from a monitor screen or reflected from a printout.


The series of actions performed on a file from creation to final output