Subtractive Colour Mixture. Transmittance Transmittance:  =  ( ) out /  ( ) inTransmittance:  =  ( ) out /  ( ) in Internal transmittance = External.

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Presentation transcript:

Subtractive Colour Mixture

Transmittance Transmittance:  =  ( ) out /  ( ) inTransmittance:  =  ( ) out /  ( ) in Internal transmittance = External transmittance - ReflectanceInternal transmittance = External transmittance - Reflectance Optical DensityOptical Density

Optical Density

Transmittance change with filter thickness

Transmittance of red/green/blue and cyan / magenta / yellow filtersTransmittance of red/green/blue and cyan / magenta / yellow filters

Subtractive colour mixture Yellow plus magenta filters transmitt redYellow plus magenta filters transmitt red

Subtractive colour mixture Yellow plus cyan filters transmit greenYellow plus cyan filters transmit green

Subtractive colour mixture Magenta plus cyan filters transmit blueMagenta plus cyan filters transmit blue

Combination of the filters Three filters of different thickness

Subtractive mixing with pigments Surface with pigment particlesSurface with pigment particles –Regular reflextion from surface –Absorption in pigment particles

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