CDIA Scanning Technology 4

Question 1

Which scanning artifact appears as a repetitive pattern of light and dark bands caused by interference between the scanner sampling frequency and the halftone screen frequency of printed images?

Accepted Answer

Moiré pattern

Answer

Moiré patterns occur when the scanner's sampling grid interacts with the periodic dot pattern of halftone-printed images, creating an unwanted interference pattern.

Question 2

In a document imaging system, what is the function of an ADF (Automatic Document Feeder)?

Accepted Answer

To automatically feed multiple documents sequentially through the scanner without manual intervention

Answer

An ADF is a mechanical attachment that picks and feeds individual sheets from a stack, enabling unattended high-volume scanning operations.

Question 3

What is 'optical density' (OD) as it relates to scanner specifications?

Accepted Answer

A measure of a scanner's ability to distinguish detail in very dark or very light areas

Answer

Optical density (Dmax) measures the scanner's ability to capture detail across its tonal range, particularly in shadows; higher Dmax values indicate better shadow detail capture.

Question 4

A production scanner consistently produces images with a faint shadow of the previous page visible in the current scan. This is known as:

Accepted Answer

Ghosting

Answer

Ghosting occurs when residual charge or optical persistence in the scanner's sensor causes a faint echo of a previously scanned image to appear in subsequent scans.

Question 5

Which color model is most commonly used internally by document scanners to capture color information?

Accepted Answer

RGB

Answer

Document scanners use RGB (Red, Green, Blue) as their native color model because it directly corresponds to the sensor's red, green, and blue light-sensitive elements.

(CDIA) Certified Document Imaging Architect Practice Test

(CDIA) Certified Document Imaging Architect Practice Test

CDIA Scanning Technology 4