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i will no doubt get canned for this but as a simple solution use levels to set background at say 10 you can do in rgb or individual if required. check values with eyedropper.(photoshop shows values of 0 to 255)leave the high end alone for now
go to curves the 0 and 255 are fixed and by lifting say the middle only you will lift middle tones Without changing the high or low point.... have a play with an s curve ( 2 points) in photoshop you can always go back a turn or two so have a bash.
processing can be far more complicated and involved but have a tinker with that first
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