This link has been bookmarked by 19 people . It was first bookmarked on 13 Apr 2008, by Narendran M R.
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01 Jan 08
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In physical terms the spectral transmission curves of the colourants multiply, so this method of colour reproduction should really be called "multiplicative". Photographers and printers have for decades measured transmission in base-10 logarithmic density units, where transmission of unity corresponds to a density of 0, transmission of 0.1 corresponds to a density of 1, transmission of 0.01 corresponds to a density of 2 and so on. When a printer or photographer computes the effect of filters in tandem, he subtracts density values instead of multiplying transmission values, so he calls the system subtractive.
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11 May 07
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22 Nov 05
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density
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01 Oct 04
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