Photography Terms And Definitions - HP T500 User Manual

Photography Terms and Definitions

Terms
Auto Focus (AF)
White Balance
Auto White Balance
(AWB)
Digital Print Order
Format (DPOF)
Exif/JPEG
JPEG
Exposure Value
ISO Speed
USB
Definitions
Auto focus refers to a camera lens' ability to adjust its configuration in
order to focus properly on a subject regardless of whether it is near or
far from the camera. Auto focus lenses generally provide vastly superior
image quality than do their fixed focus cousins since they do not have to
rely on their depth of field. Also known as: "AF", "auto-focus".
The adjustment of electronic still picture color channel gains or image
processing so that radiation with relative spectral power distribution
equal to that of the scene illumination source is rendered as a visual
neutral.
With auto white balance, the camera attempts to determine the
color temperature of the light and automatically adjust for that color
temperature. Many people just leave the camera set to auto white
balance all the time.
A standardized ASCII file created in a digital camera and stored on
removable media along with the image files that indicate how many
copies of which images should be printed. It also allows index prints,
cropping, and text overlays to be specified.
A compressed file format for digital cameras in which the images
are compressed using the baseline JPEG standard, described in ISO
12234-2, and metadata and thumbnail images are stored using TIFF
tags within an application segment at the beginning of the JPEG file.
Joint Photographic Experts Group. An image compression method
defined in ISO/IEC 10918-1.
A numerical value that is inversely proportional to the exposure provided
to an image sensor to obtain an image. Images obtained from a camera
using a range of exposure index values will normally provide a range of
image quality levels.
A numerical value calculated from the exposure provided at the focal
plane of an electronic camera to produce specified camera output signal
characteristics using the methods described in the referenced standard.
The ISO speed should correlate with the highest exposure index value
that provides peak image quality for normal scenes.
Universal serial bus, a digital interface for connecting up to 64 devices
in a tiered-star topology. See http://www.usb.org.
4