major adjustments later in your image editing software is not ideal, since no extra
data is available to cover the gaps these edits create. The most common correction
tools in Photoshop Elements are those in the Adjust Lighting section, and the Adjust
Hue Saturation tools.
In the full version of Photoshop, processing the Jpeg images would proceed similarly,
though there are many more correction tools available.
Color Settings for Elements and Photoshop
When using Photoshop Elements, set Color Management to Full Color Management,