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Digital Imagery Necessary Multimedia Vocabulary #2

Digital Imagery Necessary Multimedia Vocabulary #2. Journalism 108. Pixels. The squares that make up a digital image. Short for “picture element.”. Bitmapped. An image defined by a rectangular grid of pixels. Also called “raster image.” The computer assigns a value to each pixel.

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Digital Imagery Necessary Multimedia Vocabulary #2

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  1. Digital ImageryNecessary Multimedia Vocabulary #2 • Journalism 108

  2. Pixels • The squares that make up a digital image. Short for “picture element.”

  3. Bitmapped • An image defined by a rectangular grid of pixels. Also called “raster image.” • The computer assigns a value to each pixel.

  4. Vectored Image • An image which is defined mathematically rather than as pixels on a bitmap. An object-oriented image. • A vectored image is one that stores the image content as a collection of objects that contain directions for drawing things on the screen.

  5. Image Formats • .PSD – Photoshop’s native file format. Use whenever you wish to maintain layers and editable text. Lossless. • .TIF – Used mainly for images intended for print. Lossless. • .GIF – Lossless compression; used on web for non-photographic illustrations. • .JPG – Lossy compression with variable quality settings. Used on web for photographic images. • .PNG – Lossless compression for photographic images on web.

  6. Scanning • The process of converting an analog image (negative, print, or transparency) into a digital file.

  7. Image Resolution • Image File Resolution - W x HThe quantity of pixel information contained in the image, e.g. 1200 x 800. • Scanner Resolution - DPIDetermines digital image file resolution • Image Printing Resolution - PPIWhen printed, the number of pixels to be contained in each inch of the printout. • Printer Resolution - DPIThe number of dots contained in each inch of the printed image.

  8. Color (bit) Depth • one-bit (black and white)each pixel either black or white • eight-bit (256 colors on screen) • grayscale or limited color • sixteen-bit (65,536 colors) • 24-bit color (16.8 million colors)Full photographic color. • 32-bit color(includes 8 bits for transparency)

  9. Examples: Bit Depth grayscale one-bit 24-bit

  10. Grayscale • The digital equivalent of a conventional black and white photograph. • Contains 256 different levels of gray, from black to white.

  11. RGB • The “Red-Green-Blue” color mode. • Most often used with the “color space” of monitors and images for the Internet.

  12. CYMK • The “Cyan- Magenta-Yellow-Black” color mode. • Most often used for color separations.

  13. CCD • Charge-Coupled Device • The light-sensitive array used to capture the image of a digital camera or a scanner.

  14. ISO • A measure of how sensitive your camera sensor or CCD it is to light. • “Normal” ISO, for taking shots outdoors on bright sunny days is 100. If you’re shooting indoors, or you’re shooting, say, sports and you want to use a high shutter speed, you may need to use a higher ISO (400 is common for sports photography). ISO goes in a doubling scale too: 50, 100, 200, 400, 800, 1600, 3200.

  15. Shutter Speed • In photography, shutter speed is a common term used to discuss exposure time, the effective length of time a camera's shutter is open.

  16. Aperture • The hole through which the light passes through to reach the sensor.

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