Topic 4: Introduction to Media Computation: Digital Pictures
The processing of some collection of:
o Picture element
o Sound fragment
o Movie frames
o Text files
o Web (html) pages
Digital data: The encoding of information in computer language (bits; 0s and 1s)
Digital media: Electronic media that records a numeric encoding (as opposed to continuous / analog recording)
o Digital cameras capture and store photos as digital data on a memory card, rather than on film
o CDs sample sound waves and record numbers that represent the sound at the time of that sample
Our eyes contain
o Rods that allow us to see black, white, and shades of gray
o Cones that allow us to see in color. Cones are sensitive to red, green, and blue light.
o All other colors are combinations of rods and cones at different intensities of light.
Our eyes and brain work together to make sense of what we see.
In an RGB model, all colors are combinations of red, green, and blue light at different intensities
White: Full intensities of red, green, and blue (255,255,255)
Black: Zero intensity of red, green, and blue (0,0,0)
Gray: Intensity of red, green, and blue being equal (x,x,x)
Red: Full intensity of red, zero intensity of green and blue (255,0,0)
Green: Full intensity of green, zero intensity of blue and red (0,255,0)
Blue: Full intensity of blue, zero intensity of g