image colour lecture
Post on 13-Jan-2015
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C O L O U R
MONOCHROMATIC
Emphasize form, light and texture
ANALOGOUS
Little energy - sit easily together without tension.
COMPLIMENTARY
extreme chromatic contrast and LOTS of energy
COMPLIMENTARY PROPORTION
SPLIT COMPLIMENTARY
TRIADIC
TETRADIC
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Any colour space (film, computer graphics, print etc) is a representational system that is designed to
mimic our human perception of vision
Accurate colour measurement begins with measure of light intensity - linear to light (not linear to our
perceptual system)
These values are then subjected to a ‘Gamma Correction’ so that the image mimics the perceptual
response of our eyes
Human vision is more sensitive in the ‘shadows’ than in the ‘highlights’
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Other Colour Spaces
CMYK
H
RGB Colour SpaceAdditive
Other Colour Spaces
CMYK
H
CMYK Colour SpaceSubtractive
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RGB - 8 bit colour spaceeg. Photoshop
3 x 8 bit colour channels (3 bytes)0 - 255 codes per channel
(0, 0, 0) = black(255, 255, 255) = white
over 16 million colours represented
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CIE Colour Space
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Colour Gamut
RGB Colour Space
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Trichromacy Eye senses colour through rod and cone cellsFovea - responsible for sharp central vision
Cone cells - concentrated at the fovea- 6 million cone cells in a human eye- three types of cone cells- Red, Green and Blue colour receptors (or long, medium and short wavelengths of light)The brain combines the information of each of the receptors to create perception of colour
Rod Cells - more sensitive to light- 120 million rod cells in a human eye- concentrated at edges of retina- 100 times more responsive than cones so used for night vision- have little role in colour vision
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