This exercise is to mimic the effects of using colour filters in black and white photography. In digital, following conversion to Black & White you can raise the brightness of red/yellow/green/blue to recreate the effect of using a filter. This has the same effect as a filter because, for example, a yellow filter will let more yellow light than any other colour, so had the effect of raising the brightness of all yellow objects.
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| colour |
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| b&w - unfiltered |
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| red filter |
The above photo is the equivalent of using a red filter - the red top is now significantly lighter than it was previously.
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| yellow filter |
And now the yellow filter makes the yellow top lighter.
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| green filter |
The green top was pretty dark so while it's made lighter it's still quite dark.
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| blue filter |
And now the blue filter.
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