Operation Manual

Glossary
Nero PhotoSnap 44
Lens Aperture
A lens aperture is an arrangement on the camera which regulates the amount of light falling
onto the lens. It determines, on the one hand, the light intensity on the data carrier and, on
the other hand, the color sharpness of the photo.
LZW Algorithm
The Lempel-Ziv-Welch algorithm uses a standard of loss-free data compression that was
developed by Abraham Lempel, Jacob Ziv and Terry Welch.
Metadata
Metadata is particular additional information for data with the purpose of describing it better
and for making it easier to find. Metadata contains information on the artist, album, track,
running time, bit rate, resolution, and so on. As a result, it is possible to categorize files ac-
cording to their type (audio, video or picture).
Picture Noise
The picture noise is an optical coarse graining which is disturbingly noticeable in a photo. As
all semiconductors, a CCD sensor chip possesses a certain basic electronic noise that is
triggered by signal superposition and interference frequencies.
PNG
A Portable Network Graphic designates a loss-free compression format for graphic files. It is
the successor to the GIF (Graphic Interchange Format) and serves mainly for the standard-
ized exchange of graphics on the Internet.
RGB
Red, Green, and Blue designate the combination of primary colors for a new color combina-
tion. In RGB mode, all the different colors are characterized by their red, green and blue
components. The color produced is the result of adding the three color components to white.
Run-length process
The run-length process designates an algorithm for loss-free graphic compression. In this
process same-colored pixels are coded with the aid of counters. The method is mainly suit-
able for black-white pictures or pictures with large same-colored areas.
TIFF
The Tagged Image File Format designates the container of a graphic format in which picture
files can be saved. It is often used in the pre-print step as an exchange format.