User manual

7 • SCANNING PRINTED MATTER

ColorQuartet 5.0 Pro

7•Scanning printed matter

Descreening printed matter

Printed matter can be scanned like any other reﬂective. However, printed images contain

screen dots that were created the first time they were output. If you rescan such an image with-

out blurring the existing screen dots, the new and old patterns of screen dots may interfere with

each other, causing an unwanted pattern known as Moiré. To avoid this, you should use Color-

Quartet’s descreening function.

• EITHER: Choose the most relevant setting from the menu in the Special Functions section of the

Magic

Touch window and, if necessary, type a different screen frequency into the text field.

• OR: Activate the Descreen check box in the Scan Setup

window and type in the screen fre-

quency of the original being scanned.

When it carries out the scan, ColorQuartet will automatically calculate an appropriate level of

blurring to remove the screen dots in the original.

If you do not know what screen frequency was used, you can find out

by using a screen gauge. This is a piece of film with special patterns on

it, designed to coincide with various different possible screen rulings.

Place the screen gauge on top of the image and rotate it until a large

cross-shaped pattern appears. The arms of the cross will point to the

relevant value on the screen frequency scale.