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5 Written questions

5 Matching questions

  1. lossy compression
  2. 24 bit color
  3. Unicode
  4. image file size
  5. bit map disadvantage
  1. a 16 bit code to represent characters from all the world's alphabets and symbols
  2. b Digital color model that uses eight bits each for the three additive colors (red, green, blue.) It can reproduce 256 shades of each primary color. Total 16 million shades. True colour.
  3. c resolution dependant (zooming will show pixels), large file size for high resolution / high colour depth, limited editing - pixel operations only
  4. d bitmap file size depends on the resolution and the bit depth for pixel colour; (length in pixels) x (breadth in pixels) x (bit depth)
  5. e some resolution data is lost, image quality affected

5 Multiple choice questions

  1. accuracy of a floating point value depends on number of bits for mantissa (significant digits)
  2. limit for smallest value (near zero) and largest value on number line depends on number of bits for exponent (moves the point)
  3. 7 bit code representing (only) latin type alphabets and language symbols
  4. image stored as collection of shapes, each represented by set of numbers defining properties such as coordinates, line thickness, fill colour, layer level
  5. 4 bytes with binary place values 2^0 to 2^31, maximum value (2^32)-1

5 True/False questions

  1. bit depthbinary values corresponding to grid of pixels including colour code


  2. bit mapnumber of bits used to code a colour, aka colour depth


  3. 16 bit color64 thousand colours


  4. data compressionsome resolution data is lost, image quality affected


  5. vector advantagelimited types of image possible, drawings only


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