Smartphones offer tools for image editing. Most people do not know them or are not experienced enough to use them.
In the CICERO Course, we use PixlR as an app on the smartphone. There exists a web-based tool for tablets or computers as well. Here you see a small example what we are doing with the tool in the course!
Image example from the course
Image example from the course
Image example from the course
Image example from the course
The sample image in PixlR
The image is opened with PixlR and the tools are displaid in the menu
Image editing
Here the image is edited: The exposure is corrected (with the slider at the bottom of the image)