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In looking at this we shall consider the following…
• Quantisation.
• Quantisation Error.
• Interpolation.
• Viewing images on lower dpi equipment.
• Interpolation.
Quantisation
• Back to those zeros and ones…• If we store a single reading using 2 bits we can record
the following light levels…
Binary Decimal00 001 110 211 3
• What do we do with a reading of 0.5?
• Print on paper A4 (600 dpi)– Image size is…– 29 x 21 cm
• Display on a monitor (72dpi)– Image size is…– 2.45 x 1.73 m
Some tips for presenting graphics on the Web.
• Use Web friendly formats (gif, jpeg, png) not Web hostile ones (tiff, bmp)
• Make use of compression if it doesn’t effect quality.
• Watch height width and colour settings.• If you must use high quality pictures
create thumbnails.• Indicate the size of the file on any related
links.