This post is about an exciting excercise we did in our class. It was an excercise for converting a colour image (or simply the raw original) into black and white version, and adjusting the colour channels afterwards. We were suppossed to chose an image that was shot outside on a sunny day preferably with blue sky (or some of blue sky). Further, there should have been other colours present so that the effect of changing the colour channels in black and white mode is well visible.
So after changing to black and white, I boosted contrast and I darkenned blue colour for the sky and the ocean, lightened the yellow.