D & L Graphic Design -

icc Profiles - sets of data that are used to produce accurate colour renditions. As different types of media respond differently to printer inks, a different profile is necessary for each paper used. Profiles can also be adjusted to satisfy the esthetic needs of an individual artist.

Giclée: (Fr - spurt) has been adopted to refer to process of printing or reproducing art on high end inkjet printers. 

RGB (Red Green Blue) refers to a colour system that uses lights of different colours that are combined to produce a wide range or gamut of colours. In the theatre this is called an additive colour system because spotlights use filters to produce colours of exact hues. When these colours overlap they produce other colours. For example R + G + B = White, and R + G = Yellow. A computer screen is similar, but uses optical mixing that exploits the weakness of our eyes. The screen's RGB pixels are so small our eyes can't resolve the individual ones and blur the pixel colours together - similar to the overlapping theatre lights.

CYMK (Cyan Yellow Magenta Black) is the colour system with which most of us are familiar. It describes colours formed by light reflected from a subject.

Light begins white and parts of the spectrum are subtracted from the white when light hits a subject and reflects back to our eyes. We see Yellow because the subject absorbs all other colours of light and reflects only Yellow. Something Black absorbs all (actually most) of the light and reflects very little. This is the system we use when mixing paints or printing our pictures. Unfortunately, CYMK has a much smaller gamut than RGB. That's why what you see on the screen often seems more vivid that what appears in print.