Thank you for your prompt reply. Maybe if I show you what I do it might help:
When I find a new webcam that I am interested in I find out the source as you will see in the bash script below.
#numberofloops=240; for ((i = 0; $i < $numberofloops; i++)); do wget http://windisgood.com/Webcams/Cookcam2.jpg -O $(date +%Y-%m-%d)_$i.jpg; sleep 30; done; shutdown -h now
The above runs every 30 seconds for 240 loops. By using the URL I get the full size image off the camera. It runs in the Terminal (C: prompt) which means it can run in the background while it does its job. When it does the last loop it then shuts the whole system down.
When I run Screen Captor I only get the small image that is active on the web page of the site. Multiples of images of that size are not really of interest to me.