Alley in Pisa, Italy

by Lars Kotthoff

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Because that is what they are. Effects have to be applied in an order. Input levels are adjustments to the levels that are coming in to the system. Output levels are adjustments to levels going out of the system. For example, perhaps on the input, a medium grey is actually what we want to be the darkest part of the image, so we set the input black point ...


Think of the levels adjustment as a mathematical function; you pass in something (input), it does something to it, and returns a result (output). The input is the existing (original) value and the output is the result after the adjustment has been applied. If you open an image and apply a levels adjustment layer and look at the input sliders, first at the ...

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