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Information and Communication Technology

Information and Communication Technology. 4.1 Digital Multimedia Elements. Ngan Wing Him 4D(19). Graphics. Two main type Bitmaps and vector graphics. bitmaps. Colletion of pixel Number of pixel is determined by the number of bits used (also called colour depth)

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Information and Communication Technology

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  1. Information and Communication Technology 4.1 Digital Multimedia Elements Ngan Wing Him 4D(19)

  2. Graphics • Two main type • Bitmaps and vector graphics

  3. bitmaps • Colletion of pixel • Number of pixel is determined by the number of bits used (also called colour depth) • ↑colour depth.=↑colour displayed

  4. Different between jpeg and png • jpeg(Joint Photographic Experts Group ) • Lossy compression • Pros:small file size • Cons:distortion after compression • png(portable network graphics) • Lossless data compression • Pros:support transparent effects, record of creator and creating date • Cons:large in size

  5. resolution • The measurement of number of pixel/unit length • For bitmap:measured by pixels/inch(ppi) • ↑ resolution=↑details = ↑file size

  6. Resolution of screen display are in range from 72 to 95 ppi Resolution of photograph printing are rage from 200 to 400ppi Length= Number of horizontal pixels resolution

  7. Vector Graphics • Composed of a number of objects • (shape,line or string of text) • Usually for simple chartsline arts and illustrations • Can be modify and rescale every details without affecting the quality • File size will not grow rapidly when more vector object are drawn

  8. word art word art

  9. ASCII Art • graphic design technique that utilizes computers for presentation • consists of pictures pieced together of ASCII characters

  10. HHHHHHHHHHHH IIIIII • HHHH HHHH IIII • HHHH HHHH IIII • HHHH HHHH IIII • HHHHHHHHHHHHHH IIII • HHHHHHHHHHHHHH IIII • HHHHHHHHHHHHHH IIII • HHHH HHHH IIII • HHHH HHHH IIII • HHHH HHHH IIII • HHHHHH HHHHHH IIIIII :) :-( (__) (oo) /-------\/ / || || * ||----|| ~~ ~~

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