File Format - The form in which digital images are stores and recorded. e.g. JPEG, RAW, TIFF, etc.
Filter - Usually a piece of plastic or glass used to control how certain wavelengths of light are recorded. A filter absorbs selected wavelengths , preventing them from reaching the light sensitive medium. Also, software available in image processing computer programs can produce special filter effects.
Flare - Unwanted light streaks or rings that appear in the viewfinder, on the recorded image, or both. it is caused by extraneous light entering the camera during shooting. Diffuse flare is uniformly reflected light that can lower the contrast of the image. Zoom lenses are susceptible to flare because they are comprised of many elements. Filters can also increase flare. Use a lens hood can often reduce this undesirable effect.
Focus - An optimum sharpness or image clarity that occurs when a lens creates a sharp image by converging light rays to specific points at the local plane. The word also refers to the act of adjusting the lens of achieve optimal image sharpness.
f/Stop - The size of the aperture or diaphragm opening of a lens, also referred to as f/number or stop. The term stands for the ratio of the focal length (f) of the lens to the width of its aperture opening (f/1.4 = wide opening f/22 narrow opening) Each stop up (lower f/number) doubles the amount of light reaching the sensitized medium. Each stop down (higher f/number) halves the amount of light reaching the sensitized medium.
GB - Gigabyte, just over one billion bytes.
Hard Drive - A contained storage unit made up of magnetically sensitive disks.
Hot Shoe - An electronically connected flash mount on the camera body. It enables direct connection between the camera and an external flash, and synchronizes the shutter release with the firing of the flash.
Icon - A symbol used to represent a file, function, or program.
Image Editing Program - Software that allows for image alteration and enhancement.
Infinity - A term used to denote the theoretically most distant point of focus.
ISO - From ISOS (Greek or equal), a term for industry standards from the International Organization for Standardization. When an ISO number is applied to film, it indicates the relative light sensitivity of the recording medium. Digital sensors use film ISO equivalents, which are based on enhancing the data stream or boosting the signal.
JPEG - Joint Photographic Experts Group, a term for industry standards from the International Organization of Standardization. When an ISO number is applied to film, it indicates the relative light sensitivity of the recording medium. Digital sensors use film ISO equivalents, which are based on enhancing the data stream or boosting the signal.
KB - Kilobyte, just over one thousand bites.
LCD - Liquid Crystal Display, which is a flat screen with two clear polarizing sheets on either side of the liquid crystal solution. When activated by an electric current, the LCD causes the crystals to either pass through or block light in order to create a colored image display.
LED - Light Emitting Diode. It is a signal often employed as an indicator on cameras as well as on other electronic equipment.
Lens - A piece of optical glass on the front of a camera that has been precisely calibrated to allow focus.
Lens Shade - Lens Hood: Also called a lens shade. This is a short tube that can be attached to the front of a lens to reduce flare. It keeps undesirable light from reaching the front of the lends and also protects the front of the lens.
Wednesday, July 30, 2014
Monday, July 28, 2014
Vocabulary 1
Automatic Exposure - When the camera measures light and makes the adjustments necessary to create proper image density on sensitized media.
Automatic Flash - An electronic flash unit that reads lights reflected off a subject (from either a preflash or the actual flash exposure), then shuts itself off as soon as ample light has reached the sensitized medium.
Aperture - The opening in the lens that allows light to enter the camera. Aperture is usually described as an f/number. The higher the f/number, the smaller the aperture, and the lower the f/number the larger the aperture.
Aperture Priority - A type of automatic exposure in which you manually select the aperture and the camera automatically selects the shutter speed.
Artificial Light - Usually refers to any light source that doesn't exist in nature such as incadescent, flourescent, and other manufactured lightning.
Available Light - The amount of illumination at a given location that applies to natural and artificial light sources but not those supplies specifically for photography. It is also called existing light or ambient light.
Backlight - Light that projects toward the camera from behind the subject.
Bit/Byte - Binary digit. This is the basic unit of binary computation, while Byte is eight bits.
Bounce Light - Light that reflects off of another surface before illuminating the object.
Bulb - A camera setting that allows the shutter to stay open as long as the shutter release is depressed.
Card Reader - Device that connects to your computer and enables quick and easy download of images from memory card to computer.
Close-Up - A general term used to describe an image created by closely focusing on a subject. Often involves the use of of special lenses or extension tubes. Also, an automated exposure setting the that automatically selects a large aperture (not available with all cameras)
Compression - Method of reducing file size through removal of redundant data, as with the JPEG file format.
Contrast - The difference between two or more tones in terms of luminance, density, or darkness.
CPU - Central Processing Unit. This is the "brains" of a computer or a lens.
Cropping - The process of extracting a portion of the image area. If this portion of the image is enlarged, resolution is subsequently lowered.
Daylight - A white balance setting that renders accurate color when shooting mid-day sunlight.
Depth of Field - The image space in front of and behind the plane of focus that appears acceptably sharp in the photograph.
Download - The transfer of data from one device to another such as from camera to computer or computer to printer.
DPI - Dots per inch, referring to printing resolution.
Exposure - When light enters the camera and reacts with the sensitize medium. The term can also refer to the amount of light that strikes the light sensitive medium.
Bit/Byte - Binary digit. This is the basic unit of binary computation, while Byte is eight bits.
Bounce Light - Light that reflects off of another surface before illuminating the object.
Bulb - A camera setting that allows the shutter to stay open as long as the shutter release is depressed.
Card Reader - Device that connects to your computer and enables quick and easy download of images from memory card to computer.
Close-Up - A general term used to describe an image created by closely focusing on a subject. Often involves the use of of special lenses or extension tubes. Also, an automated exposure setting the that automatically selects a large aperture (not available with all cameras)
Compression - Method of reducing file size through removal of redundant data, as with the JPEG file format.
Contrast - The difference between two or more tones in terms of luminance, density, or darkness.
CPU - Central Processing Unit. This is the "brains" of a computer or a lens.
Cropping - The process of extracting a portion of the image area. If this portion of the image is enlarged, resolution is subsequently lowered.
Daylight - A white balance setting that renders accurate color when shooting mid-day sunlight.
Depth of Field - The image space in front of and behind the plane of focus that appears acceptably sharp in the photograph.
Download - The transfer of data from one device to another such as from camera to computer or computer to printer.
DPI - Dots per inch, referring to printing resolution.
Exposure - When light enters the camera and reacts with the sensitize medium. The term can also refer to the amount of light that strikes the light sensitive medium.
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