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You paint with your camera movements, and within its menus. With nearly always superlative results, like this last one, as far as I can tell.
These two are patterns created by foam running from waterfall, resting and coalescing on the shore of a stream. That was natural colour with a little contrast added to heighten the contrast. You can even see a little blue and yellow.JR
From my "hanging around the house" series.
Nice.