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

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Presentation on theme: "Subtractive Colour Mixture. Transmittance Transmittance:  =  ( ) out /  ( ) inTransmittance:  =  ( ) out /  ( ) in Internal transmittance = External."— Presentation transcript:

1 Subtractive Colour Mixture

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

3 Optical Density

4 Transmittance change with filter thickness

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

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

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

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

9 Combination of the filters Three filters of different thickness

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

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