The object of this exercise is to take a shot of four objects contrasting in colour as a still life. Then, to convert the colour image into black and white in a photography processing software, I’ve used Photoshop Elements 4. Now to look at the effect of colour filters on a black and white image. In Elements the effect of different colour filters can be achieved in the software rather than having to use physical filters on the camera lens.
For this exercise four colour filters are to be used: red; yellow; green; blue. the first images below are the original colour photograph and the processed black and white image.
This is the first image as taken in colour.
This is the same image processed in Photoshop Elements:
The red filter allows red light through so will appear much lighter, also has affected yellow and green making them much lighter but prevents blue light getting through making blue darker.
The yellow areas become much lighter as yellow light being allowed through. The blue again becomes much darker. the red is much lighter also so this filter must allow red light through as well.
The tone of the blue is lighter as the blue filter allows blue light through. The red is affect so it is almost black and yellow also darker as yellow light is blocked.
Again as the filter allows its own colour through, in the case green, the green is much lighter. The yellow is very light and the red is a mid grey.
An interesting exercise that has help my understand of colour light, filters and the effect it can have on an image.