General information:
Is there a way to capture only the frame of a specific app window? I mean with built-in macOS screencapture, I can do something like this to get a screenshot of a particular app:
os.system("screencapture {options} -l {window} {filename}")
where {window} represents the windowID of the app, in my case QuickTime Player app ID (obtained from Quartz).
Being able to specify which app I want to take the screenshot of would result in a more flexibility, as I can move the app window wherever I want and I don't need to set any kind of boundary (top,left,width,height).
cheers, mate!
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