Colours into tones.

Exercise: Colours into tones.

The drummer was outside a botanical garden in Sri Lanka and was making the most awful noise but with great enthusiasm.

 I have kept this simple and used only the blue slider for the first image and the red for the second.  The effects on the blue plastic and the red drum were obvious with the lightening of the filter colour and the darkening of its complementary one, but what I had not thought through was the effect of the red slider on the man's dark brown face which was darkened by the blue filter and substantially lightened by the red and  showing more detail as a result.