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HP 618 Digital Camera User’s Guide 117 Glossary
file size
The number of bytes in a file. The file size for images saved on a digital camera is determined by the
resolution of the camera's CCD and the amount of image data compression. You can usually select the
amount of compression on the camera and again in the computer software that processes the images.
Note that if you compress an image on the camera and in the software, the compression is cumulative.
file type
The digital format in which a file is saved. Computer programs can insert or import files that were saved in
a file type that the program supports. Common file types for images include JPEG (Joint Photo Expert
Group format) and TIFF (Tagged Image File Format). See also “JPEG” on page 118 and “TIFF” on page 122.
firmware
The low-level software that runs in a digital camera and controls the functionality and user interface on
the camera.
firmware update
The process of updating to a new firmware version on the digital camera.
flash
A brief, intense burst of light from an electronic flash unit on a camera. Use flash when the lighting in a
scene is inadequate for taking pictures.
flash mode
This mode is set by pressing a status LCD button on top of the camera and determines how the flash will
operate.
flash mode button
A status LCD button on the top of the camera that you press to set the flash mode.
flash mode icon(s)
An icon or set of icons in the status LCD that shows the current flash mode.
f-number
The f-number (also called the f-stop) is related to the diameter of the lens aperture
−
dividing the focal
length of the lens by the f-number specifies the aperture diameter. The f-number is used in conjunction
with the shutter speed to set the exposure. A standard set of f-numbers is commonly used in camera
lenses. A lower f-number, such as f/2.8, indicates a larger aperture, which lets in more light. A higher
f-number, such as f/16, indicates a smaller aperture, which lets in less light. See also “aperture” on page 115
and “focal length” on page 117.
focal length
The distance between the center of the lens (more precisely, its rear nodal point) and the CCD sensor in
digital cameras when the lens is focused on infinity. The focal length is specified in millimeters.
focus
Refers to adjusting the lens in a digital camera in order to place a clear image on the plane of the CCD
sensor.
focus mode
See “Auto Focus mode” on page 115 and “Manual Focus mode” on page 119.
focus range
See “auto focus range” on page 115.
four-way controller
See “4-way controller” on page 115.
f-stop
See “f-number” on page 117.
grouped images
A number of images that are bundled together. You can group images in the Edit menu of Review mode.
Grouped images appear in a folder on the memory card when the camera is connected to a computer.