Operation Manual

Glossary
Nero PhotoSnap 43
11 Glossary
DPI
The Dots per Inch give the number of pixels per inch (1 inch = 2.54 cm) and thus the resolu-
tion which an output device, such as a printer, can provide.
EXIF
EXIF stands for Exchangeable Image File Format and is a standard of JEITA (Japan Elec-
tronic and Information Technology Industries Association) for metadata in picture files. In-
formation such as camera type, aperture, exposure time, distance to object and the date
when the photo was taken can be stored in the metadata. The graphic formats JPEG and
TIFF are supported. The metadata is written in the header, thus in front of the actual picture
information.
Hot pixel
A hot pixel is a point in a picture, which in digital photography appears in strong additional
color in the background and occurs mostly when the image sensor of the digital camera gets
too hot while photographing or when the period of exposure to light is too long. It occurs due
to inaccuracies in chip manufacturing. Hot pixels can be removed from the photo by means
of special filters.
HSL
The HSL mode (Hue; Saturation; Lightness) determines a color by means of the hue, the sa-
turation and the lightness.
Interpolation
The interpolation is a process in which pixel values known from analysis are shot on to un-
known values. This procedure serves for the seeming enhancement of the resolution of
graphics, videos and photos.
ISO number
The ISO (International Organization for Standardization) number is a standard for defining
light sensitivity in the field of analog photography. The graininess increases with increasing
ISO number, leading to the picture becoming coarser. The greater the ISO value, the quicker
the film absorbs the light. Thus the lighting times become shorter. The sensitivity of CCD
chips is constant, but a higher ISO number can be simulated in that the sensitivity can be in-
creased by an increase in the signal strength. An unwanted result of picture signal strength-
ening is an increase in picture noise.
JPEG
The Joint Photographic Experts Group-Format denotes a file standard for compression of
pictures with resulting losses. Pictures compressed with JPEG carry the file extensions *.jpg
or *.jpeg.