New answers tagged contrast
There are many ways to do just about anything in Photoshop. Two approaches that I would try would be: Duplicate the original, convert to CMYK and apply the yellow channel to the black channel in Multiply mode (Image > Apply Image). You could also try simply copying the yellow channel and pasting it on a new layer, using Darken or Darker Color as a blend ...
I'd probably just use the magic wand, experimenting with settings of how many pixels it is tolerant of to select those areas while holding shift to get multiple selections. Then once all is selected experiment with curves, levels or brightness to get the look you want.
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