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ENCODING IMAGES AND SOUND, File size = image resolution x colour depth =…
ENCODING IMAGES AND SOUND
IMAGES
bit depth
pixels
colour depth
2^n = total number of colours
n = number of bits per pixels
SOUND
the amplitude of the wave is sampled at regular intervals - this is converting analogue to digital
a lot of the data is lost
these samples are blocks of data that can be stored digitally
Colour of each pixel represented by binary code
For greyscale images, the bit depth is usual two, so four different colours are possible with 00, 01, 10, and 11.
Black and white images only use two colours, so only one bit is needed per pixel. 0 for black, 1 for white.
This increases colour depth.
Resolution = number of pixels in a picture Colour depth = number of bits per pixel
initially an analogue signal, can't be stored by a computer
File size in bits =
Sample rate x bit depth x length (in seconds)
File size = image resolution x colour depth = width x height x colour depth