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Photoshop you can run a Auto Levels
Alternitively you can do it manually with greater control
open the histogram up of the R G B channels
open up Levels (Image --> Adjustment --> Levels)
you have 3 options RGB combined, and the individual channels align the histogram so they all drop under each other. You can also use this technique for a DPP stretch.
Hope that helps oh and for the record i havn't bothered with WB/Custom white balance for ages unless im doing terrestrial work which makes post processing a whole lot easier. Astro is different as you are stretching the data out to fill the full 16 or 32 bit gamut.
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