Ricoh AP 306D [76/77] Printing guideline for ricoh color products 2 1

Printing Guideline for Ricoh Color Products 2.01

ProÞ le

A proÞ le describes the gamut of a color device. It is used by a color management

sytsem to convert colors from one device color space to another. If it follows the

ICC standard, it is referred to as ICC proÞ le. To specify the purpose of a proÞ le in

a color convertion, combined terms are used, such as device proÞ le, source proÞ le,

destination proÞ le, etc.

ProoÞ ng

ProoÞ ng or simulation means the representation of one printing process‘ gamut

(generally an offset print gamut) on another output device like a color copier, printer

or proofer. Simulation or prooÞ ng can be realised with color management and ICC

proÞ les by applying 2 proÞ les in a row. First the original data is converted to the

Þ nal print process gamut, e.g. by an Euroscale ICC proÞ le, and then it is converted

colorimetrically to the proofer‘s gamut. Soft prooÞ ng means the simulation of an offset

printing process‘ gamut on a monitor.

Relative colorimetric

This rendering intent does exactly the same as absolute colorimetric, but it

additionally compares the white points of the source and destination gamuts and

shifts the colors accordingly.

Rendering Intents

These are methods used by the CMM to map colors from one device‘s gamut

to another. The four methods are perceptual, saturation, relative colormetric and

absolute colorimetric and correspond to the type of document data that is converted,

such as images or graphics.

RGB

Red, green and blue, representing the primary colors of the additive color model,

which is based on light. Adding 100% of each primary color produces white, while

black is the absense of light (0% of red, green and blue). RGB is the color model used

by input devices and monitors.

Saturation

This rendering intent preserves the vividness of colors and preserves saturation

rather than hue. It is commonly used for business graphics, where bright, saturated

colors are more important than relation between colors.

Simulation

See ProoÞ ng.

sRGB

sRGB is one of the standard RGB color spaces, which for example is used by some

Microsoft applications and Ricoh‘s RPCS driver as a standard and which can be

selected in many applications as RGB color space.