User manual

9 • Scanning to RGB

ColorQuartet 5.0 Pro

Modifying images directly in RGB

What it means

• If you are outputting images in RGB form, for example, on an RGB-based printer or proofer or

for use in an on-screen application such as a web site, ColorQuartet lets you modify gradation

and gray balance directly in RGB.

• This is done with the RGB Curves, which are based on the currently active RGB Proﬁle. The

curves are an alternative to the gr

adation curve and gray balance functions, which are defined

in terms of CMYK or L

CH.

How to do it

1 • From the Color menu or the tool bar, open the RGB Curves window.

2 • To change a curve, first click on the red, green or blue stripe. Then change the curve by

dragging its “handles” until the desired effect is observed in the feedback windo

>>> Related topics:

radation

Gray balance • Overview

Cancelling color changes

Saving and retrieving color tool settings

• The bottom scale of the RGB curves refers to the L* values of the scan (which

is considered the “input” image).

• The left-hand scale refers to the RGB values of the reproduction (the “out-

put” image).

• To produce additional handles, click anywhere on the curve.

• If you raise a curve, the image will become lighter, but the gray balance will

also change. Similarly, if you lower a curve, the image will become darker,

but its gray balance will change.

• Therefore, to change the gradation without changing the gray balance, all

three curves must be raised or lowered equally.

• If you do want to change the gray balance, move the curves individually

until the desired effect is observed.