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Bits and Bytes

Bits and Bytes. Bits - a shortening of the words “binary digit." bits have only two possible values: 0 and 1. Bytes -8-bit collections, are called bytes. With 8 bits in a byte, you can represent 256 values ranging from 0 to 255.

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Bits and Bytes

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  1. Bits and Bytes • Bits- a shortening of the words “binary digit." bits have only two possible values: 0 and 1. • Bytes-8-bit collections, are called bytes. With 8 bits in a byte, you can represent 256 values ranging from 0 to 255

  2. A megabyte is a unit of measurement for computer storage, memory and information; while its exact definition varies, it is in theory equal to one million bytes. The symbol for megabyte is MB (note B for Byte, lowercase b would mean bit). 1,024 Byte = 1 Kilobyte (KB) 1,024 Kilobyte (KB) = 1 Megabyte (MB)1,073,741,824 Bytes = 1 Gigabyte (GB) 1 Gigabyte (GB) = 1,024 Megabyte (MB) Megabytes

  3. Pixels A pixel is the most basic component of any computer graphic. Pixel stands for picture element. It represents the smallest thing that can be drawn on a computer screen. Every graphic is made up of a grid of pixels. When these pixels are painted onto the screen, they form an image. This grid of pixels is called a bitmap.

  4. Mega Pixel • 1 million pixel image. Usually produced with high-end digital cameras. The greater the pixel count of an image, the higher the resolution of that image.

  5. Resolution • The sharpness and clarity of an image. The term is used to describe monitors, printers, and bit-mapped graphic images. • Screen resolution signifies the number of pixels on the entire screen, a 640-by-480 pixel screen is capable of displaying 640 distinct dots on each of 480 lines, or about 300,000 pixels. Monitors and projectors are only about 72DPI.

  6. Ink Jet Printer Color Halftone Screen Television or Monitor

  7. Calculating Resolution • Formula: Number of Pixels/PPI=Inches 1200pixels/200ppi= 6” 1200pixels/300ppi= 4” 2400pixels/200ppi= 12” 2400pixels/300ppi= 8” • The greater the PPI the larger the file size.

  8. Output Types

  9. File Sizes Inkjet printer: • 10 x 8 inches at 720 DPI (720/5 = 144 PPI) = 1440 x 1152 pixels = 4.75mb file. Offset press: • 10 x 8 inches at 1.5x for a 150 line screen = 225 PPI = 2250 x 1800 = 11.6mb file. Continuous Tone: • 10 x 8 inches at 305 pixels per inch on a LighJet printer = 3050 x 2440 pixels = 21.3mb file. Monitor: • 10 x 8 inches at 800 x 600 resolution on a 17 inch monitor with 12.8 inches on the horizontal side = 62.5 PPI = 625 x 500 pixels = 916K file. Web Graphics: • 10 x 8 inches at 800 x 600 resolution on a 17 inch monitor with 12.8 inches on the horizontal side = 62.5 PPI = 625 x 500 pixels = 916K file.

  10. Printing Your Image • PPI- Pixels Per Inch-the greater the number the larger the image file • DPI- Dots Per Inch-the greater the number the higher resolution of the print image • LPI- Lines Per Inch-used by printers • Image should be saved in a .TIFF or .EPS file for printing. • A typical print image is 150 lines per inch which equals 300PPI. • Converting a RGB.TIFF to a CMYK.TIFF should be done to create a more accurate print.

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