For this exercise I have used the coloured filter presets in Lightroom to show the effects of the filters on black and white photographs. I have used the purest colours I could find so that the effects would be as clear as possible.
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Original Colour Image
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As you can see from the above image I have included a grey card as a mid-tone so that I can check that the exposure is correct.
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| Straight Black and White Conversion |
The image above is a straight black and white conversion which has a full range of tones from nearly white to black.
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| Red Filter |
With a red filter in place you can see that the most obvious change is that the red tomatoes have been lightened considerably, this is because the filter colour used lightens that particular colour and darkens its opposite on the colour wheel. The lemon has also been lightened slightly and has lost some detail.
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| Yellow Filter |
The yellow filter has lightened the lemon and tomatoes and has darkened the blue denim.
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| Green Filter |
The green filter used in the image above has had the least effect of all the filters, the tomatoes are ever so slightly lighter as is the lemon and lime.
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| Blue Filter |
The difference using the blue filter is very dramatic, the tomatoes are glossy jet black, the lemon and lime have both been darkened. The darkening of the lemon has really enhanced the appearance of its texture and whereas in the preceding images it seemed quite flat, in this image it has become dominant.
I think it would be interesting to try this exercise with a film camera to see if these computer generated images are true to life
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