I would like to create some training data for a neural network. Let's say I have a photograph of lots of biological cells. I want to draw a box of a fixed size around each cell and save the selection as a separate file.
What software could accomplish this? I'd like something free and open-source, that works on Windows. Ideally I'd like a workflow in which I click on the image, a pre-specified box shows up, the file gets automatically cropped and saved, and then I can carry on clicking and cropping.