If your images are either lacking in extremes of highlight or shadow or have too much of both, Paint Shop Pro offers lots of alternatives: contrast, highlight/midtone/shadow (HMS) adjustment, saturation, and gamma, for example. A simple alternative worth trying is to give your image some gentle exercise: equalizing or stretching.

Equalizing gives a more even distribution of pixels from dark to light. Usually, it's the solution you want. Stretching tends to extend the highlights and brighten the overall picture. Choose either Adjust, Brightness and Contrast, Histogram Equalize or Adjust, Brightness and Contrast, Histogram Stretch. (Each command does its job immediately without providing a dialog box or any other means of adjustment.)