Senior CSA Test-Photo Glossary

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Author:
megsy1030
ID:
94371
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Senior CSA Test-Photo Glossary
Updated:
2011-07-18 01:21:15
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Senior
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All Photo Glossary Terms
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  1. Angle of View
    the amount of a scene that can be recorded by a particular lens;determined by the focal length of the lens
  2. Adapter
    Used to insert a smaller storage device into a larger slot in a computer or other device
  3. Aperture
    The lens opening formed by the iris diaphragm inside the lens. The size of the lens can by made larger or smaller by the autofocus system or a manual control
  4. Aspect ratio
    The ratio between the width and height of an image or image sensor
  5. ATA
    A standard for storage devices that lets them be treated as if they were hard drives on the system. Any ATA compatible media can be read by any ATA device
  6. Automatic exposure
    A mode of camera operation in which the camera automatically adjusts the aperture, shutter speed, or both for proper exposure
  7. Automatic flash
    An electronic flash unit with a light sensitive cell that determines the length of the flash for proper exposure by measuring the light reflected back from the subject
  8. Bayer Pattern
    a pattern of red, green, and bllue filters on the image sensor's photosites. there are twice as many green filters as the other colors because the human eye is more sensitive to green and therefore green color accuracy is more important
  9. Bit-mapped
    formed from pixels with each pixel a shade of gray or color. Using 24 bit color, each pixel can be set to any one of 16 million colors
  10. Card
    The sealed package containing storage chips or other devices with electrical connectors that make contact when inserted into a card slot on a camera printer computer or other device
  11. CCD raw format
    the uninterpolated data collected directly from the image sensor before processing
  12. Charge-coupled device (CCD)
    An image sensor that reads the charges built up on the senor's photosites a row at a time
  13. CMOS image sensor
    an image sensor created using CMOS technology
  14. Color Balance
    the overall accuracy with which the colors in a photograph match or are capable of matching those in the original scene
  15. Color depth
    the number of bits assigned to each pixel in the image and hte number of colors that can be created from those bits. True color uses 24 bits per pixel to render 16 million colors
  16. Compression, lossless
    A file compression scheme that makes the file smaller without degrading the image
  17. Compression, lossy
    a file compressio scheme that reduces the size of a file but degrades it in the process so it can't be restored to its original quality
  18. compression
    the process of reducing the size of the file
  19. Depth of Field
    the distance between the nearest and farthest points that appear in acceptably sharp focus in a photograph. DOF varies with lens aperture, focal length, and camera to subject distance
  20. Download
    sending a filed from another device to your computer
  21. exposure
    the act of allowing light to strike a light sensitive surface. the amount of light reaching the image sensor, controlled by the combo of aperture and shutter speed
  22. Exposure Compensation
    the ability to adjust exposure by one or two stops to lighten or darken the image
  23. Exposure/focus lock
    The ability to point at one part of hte scene and hold the shutter button halfway down to lock in exposure and focus settings when you point the camera elsewhere to compose the scene
  24. Fill Flash
    Flash used to fill shadows even when there is enough light to otherwise take the photograh
  25. Ring Flash
    A special circular flash that fits over a lens to take close up pictures
  26. Slave Flash
    A flash that fires with it senses the light from another flash
  27. FlashPix
    An image format that contains a number of resolutions, each of which is broken into tiles that can be edited and displayed independently
  28. Focal Length
    the distance from the optical center of the lens to the image sensor when the lens is focused on infinity. the FL is usually expressed in mm and determines the angle of view (how much can be included in the frame) and the size of the objects in the image. The longer the FL the narrower the angle of view and the more objects are magnified
  29. Focus
    the process of bringing one plane of the scene into sharp focus on the image sensor
  30. Frame Grabber
    a device that lets you capture individual frames out of a video camera or off a video tape
  31. Frame Rate
    the number of pictures that can be taken in a given period of time
  32. f-stop
    the numerical designation indicating the size of the aperature
  33. GIF
    an image file format designed for display of line art on the Web
  34. Gray market
    importing camera equipment outside the normal manufacturer's distribution channels to take advantage of lower prices elewhere in the world
  35. Gray scale
    a series of 256 tones ranging from pure white to pure black
  36. Guide Number
    a rating of a flash's power
  37. Hot Shoe
    A clip on the top of the camera that attaches the flash unit and provides an electrical link to synchronize the flash with the camera shutter
  38. Image Sensor
    A solid state device containing a photosite for each pixel in the image. Each photosite records the brightness of the light that strikes it during exposure
  39. Interpolation
    in an image, it adds extra pixels. it's done with some zoom lenses
  40. Inverse Square Law
    the physical law that causes light from a flash to fall off in such a way that as flash to subject distance doubles, the light falls off by a factor of 4
  41. ISO (Internation Organization for Standardization)
    A number rating indicating the relative sensitivity of light of an image sensor or film. Faster film (high ISO) is more sensitive to light and requires less exposure than slower film
  42. JPEG
    A very popular digital camera file format that uses lossy compression to reduce file sizes.
  43. Long Focal Length Lens
    telephoto lens; a lens that provides a narrow angle of view of a scene, including less of a scene than a lens of normal FL and therefore magnifying objects in the image
  44. LZW
    a compression scheme used to reduce the size of image files
  45. Macro Mode
    a lens mode that allows you to get very close to objects so they appear greatly enlarged in the picture
  46. Matrix Metering
    an exposure system that breaks the scene up into a grid and evaluates each section to determine the exposure
  47. Megapixel
    An image or image sensor with over one million pixels
  48. Multi-megapixel
    an image or image sensor with over 2 million pixels
  49. Multiple Exposure
    an image made up of two or more images superimposed in the camera
  50. Noise
    Pixels on the image sensor that misread the light
  51. Normal Focal Length Lens
    a lens that provides about the same angle of view of a scene as the human eye and does not seem to magnify/diminish the size of objects in the image unduly
  52. Open up
    to increase the size of the lens aperature. the opposite is to stop down
  53. Orientation Sensor
    A sensor that knows when you turn the camera to take a vertical shot and rotates the picture so it won't be displayed on it's side when you view it
  54. Overexposure
    Exposing the image sensor to more light than is needed to render the scene as the eye sees it. results in too light of phot
  55. Parallax
    an effect seen in closeup photography when the viewfinder is offset by some distance from the lens. the scene through the viewfinder is offset from the scene through the lens
  56. Photosite
    A small area on the surface of an image sensor that captures the brightness for a single pixel in the image. there is one photosite for each pixel in the image
  57. Pixelization
    an effect seen when you enlarge a digital images too much and the pixels become obvious
  58. Pixels
    the small picture elements that make up a digital photograph
  59. Prosumer
    A very serious photographer who can be either an amateur or professional
  60. Rangefinder
    a camera design that has a viewfinder separate from the lens
  61. RAW
    an image file containing all the data captured by the images sensor but not processed in the camera. the highest quality image format
  62. Read Out Register
    the part of a CCD image sensor that reads the charges built up during an exposure
  63. Recycle Time
    the time it takes to process and store a captured image
  64. Refresh Rate
    the time it takes the camerato capture the image after you press the shutter release
  65. Interpolated Resolution
    a process that enlarges an image by adding extra pixels without acutally capturing light fro those pixles in the initial exposure
  66. Optical Resolution
    the true resolution of an image based on the number of photosites on the surface of the image sensor
  67. Resolution
    an indication of the sharpness of images on a printout or the display screen. it is based on the number and density of the pixels used. the more pixels used in an image, the more detail can be seen and the higher the image's resolution
  68. RGB
    the color system used in most digital cameras where red, green, and blue light is captured separately and then combined to create a full color imag
  69. Short Focal Length Lens
    wide angle; a lens that provides a wide angle of view of a scene; including more of the subject area than does a normal FL
  70. Shutter Speed
    the length of time the shutter is open and light strikes the images sensor
  71. Shutter
    the device in the camera that opens and closes to let light from the scene strike the image sensor and expose the image
  72. SLR
    single-lens reflex, a type of camera with one lens which is used both for viewing and taking the picture
  73. Spot Metering
    autoexposure is based on a meter reading of a small circle in the center of the viewfinder
  74. Stop
    an aperature setting that indicates the size of the lens opening. a change in exposure by a factor of 2. changing the aperature from one setting to the next doubles or halves the amount of light reaching the image sensor. changing the shutter speed from one setting to the next does the same thing. either changes the exposure one stop
  75. Stop down
    to decrease the size of the lens aperature. opposite of open up
  76. TIFF
    tagged images file format; a popular lossless image format used in digital photography
  77. Thru The Lens (TTL)
    a camera design that let's you compose an image while looking at the scene through the lens that will take the picture.
  78. Underexposure
    exposing the film to less light than is needed to render the scene as the eye sees it. results in too dark photo
  79. Upload
    Sending a file from your computer to another device
  80. VGA
    a resolution of 640 x 480
  81. Viewfinder
    a separate window on the camera through which you look to compose images
  82. White Balance
    An automatic or manual control that adjusts the brightest part of the scene so it looks white
  83. Zoom Lens
    a lens that lets you change focal lengths on the fly

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