Levels are good for changing colours, bringing out the best colours in photos. getting your white balance correct most times. You have a colour picker for white grey and black to do this. There are five channels in levels.
Value - take the slider to the left and it will lighten your whole photo. To the right and it will darken it.
Red - Take the slider to the left and you will enhance the red in the photo. To the right and it will remove some red and replace it with green.
Green - Take the slider to the left and you will enhance the green. To the right and you will get magenta/dark pink.
Blue - Take the slider to the left and you will enhance the blue. To the right and yellow will be the dominant colour.
and Alpha
Curves also have five channels.
Changing to the different channels and moving the line up or down you will see a change.
The main one used in restoration is Value where you can lighten or darken a photo.
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