I was very surprised only 20% of papers had any image alterations. I suspect the vast majority of this is necessary due to including photographs. It's essential

I was very surprised only 20% of papers had any image alterations. I suspect the vast majority of this is necessary due to including photographs. It's essentially impossible to make photos appear properly without messing with the levels. I also wonder about false positives from things like changing a chart legend label with GIMP at the last minute instead of regenerating the figure.