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fence
!!POey2hdozCZ
it's easy. the histogram is just a graph of the amount of pixels that are at a certain brightness. a big spike means you have a lot of pixels at that value. flatline means there's no pixels at that value. you have three sliders. the middle slider effectively controls brightness. the outer two sliders control contrast, by setting what value you want to be 0 0 0 (black) and what value you want to be 255 255 255 (white). move the right slider to the point right where the histogram goes flat. do the same for the left. you now have good contrast. move them too far towards the center and you start clipping values.
if you adjust for all channels at once, you get overall contrast adjustment. if you adjust one channel by itself, you get fine tuned color balance. you can also tune color balance by using the black, grey and white eyedroppers to set what shades you want to be black, grey and white respectively.
once you try it, it's very simple.
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