I am sometimes impressed what you can do with Photoshop which is a Windows application. For us Linux users, the free photo manager Shotwell provides simple tools. Here is an original image.
And here is a post-processed image obtained by a little straightening and a little adjustment.
So If you are short of funds in buying Windows powered computers and Photoshop software, LInux provides simple tools in Shotwell. The following are available:
Enhance, Crop, Straighten, Red-eye, Adjust.
Enhance will try to improve the contrast. Crop allows to select a region in the photo, Straighten allows to straighten photos, Red-eye will remove red eye reflections in photos which used flasth and Adjust allows setting the Exposure, Saturation, Tint, Temperature and Shadows. The best thing to do is to install Shotwell, which is already standard in Ubuntu based Linux distributions.
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