Crop Images Documentation

[angela337]

I was using the image cropper tool (Cemrg Motion Quantification -> Step 2: Process Images -> Crop Images) and I had trouble working out how to use the cropper. Can we please add some documentation/pop out a box when you click on the "Crop Image" tool to inform the user of how to use this.
It would also be good to note there that after you crop the image and save it, it overwrites the original image.
"Ctrl" + left click mouse: moves the yellow box relative to the image
"Ctrl" + right click mouse: moves the bounds of the yellow box.