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Colour film Subtactive colour mixing Three layers in the film: –blue sensitve: yellow layer –green sensitive: magenta layer –red sensitive: cyan layer Silver halid + colour coplers + pigments Negativ film - colour reversal: slides
Structure of a colour film
Colour picture development
Spectral characteristics of pigments Lambert-Beer law: – : absorption coefficient – l : layer thickness – d : concentration – 1 ( ) = e - ( )× l transmission at unit thickness
Spectral transmission of pigments
Optical density D = - log ( D Spectral density: D( )= -log( ( ) ) = = -log[exp(- ( ). d.l )] = ( ). d.l D 1 ( ) = ( ). d(1).l, density at unit conc. D( ) = d. D 1 ( )
Total transmittance Transmittance: Y M C Density: D DY DM DC = d Y DY d M DM d C DC Units: d Y = d M = d C = 1 gray equiv. conc.
Colour densities of a positive film
Chromaticity Film - EBU comparison: 9,7
Spectral sensitivity of film - 1 Positiv film, sensitivity maxima should be there where main density/side density maximal. 9,9
Spectral sensitivity of film - 2 Typical negative film (daylight - incandescent light film): 9,10
Effect of sp. sensitivity on exp. If sp. maxima of the three sensitivities differ more, larger exp. differences occure
Exposition, negative film Exposition: H = E. t log (H) - D: 9.12 Gradation ( ): D n = C + log (H/H 0 ) D n = D n0 - D v D v : Density of object
D - D diagram of negativ film
H-D diagram of revers.film
D-D diagram of revers.film D u = D u0 +. D v, where – D u density of revers.film – D v density of target
Combined photo techniques Negative-positive technique –Negative film has low gamma –Positive film has high gamma
Masking Compensation for side densities –Produce from same target pos. + neg. image Pos.: D p = p × D v ; Neg.: D n = D n0 - n × D v ; –Combining the two: D k = D n + D p = ( p - n ).D v + D n0 ;
Simplified model of masking
Subtractive Colour Mixture. Transmittance Transmittance: = ( ) out / ( ) inTransmittance: = ( ) out / ( ) in Internal transmittance = External.
SNC2D. Primary LIGHT colours are red, green, and blue SECONDARY light colours are created by combining only two of the three primary colours of light.
Subtractive Colour Mixing. 1.Explain why a magenta sweater is magenta. When white light strikes the magenta sweater, the sweater absorbs the green and.
Seeing in colour Stare at the coloured dot in the middle of the next picture for a minute. Then describe what you see when you look at the next slide.
Dispersion of Light Primary Concept of Colours of Objects
There are 3 primary colors of light RED, GREEN, & BLUE When these colors of light are mixed… White Light is produced This process is called color.
10.1 Wave model of light Colour Theory. Wave Model of light Remember: Light waves transfer energy Light moves outward in all directions from its source.
Color Image Processing A spectrum of possibilities…
Colour by Subtraction SNC2P – Optics.
R O Y G B V ellowreenrangelueiolet LONG SHORT ed low energy high energy.
Principles of Light The Science Behind Photography.
Colors of Pigment The primary colors of pigment are magenta, cyan, and yellow. [http://www.metatoggle.com/design_crs/color/primary.gif]
Silver-halide “AgX” AgIsilver iodide AgBrsilver bromide AgClsilver chloride.
W14D1. Multimedia Representation of colour (photos, videos) Representation of sound. Comp.Sci. questions: what is colour? how can computers capture &
Dye Sublimation Color Management
Light and Color There are 3 primary colors of light RED, GREEN, & BLUE
INTRO TO LIGHT. Learning Scale 4 – Design an experiment to show how waves move at different speeds through different materials. 3 – Explain why waves.
ENVE 201 Environmental Engineering Chemistry 1 COLORIMETRY Dr. Aslıhan Kerç.
Colour Wheel How to mix the colours you want!. Additive color refers to the mixing of colors of light. This example shows how the light from red, green.
General Characteristics Neutral Characteristics: Viewing Illuminant Sensitivity Neutral Characteristics: Color Balance Grayscale Characteristics Color.
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