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Screenshot Image of a Web URL Content ONLY

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Hi

I have managed to capture a screenshot image of a web URL, create a thumbnail of that URL (from the HTML code I get) and save it on the server (and save the filename if the DB).  I still have 2 issues though: 

- Is there a way to know the width in pixel of an external website's web page dynamically?  I simply want to get an image only covering the content (the real content) as some websites are built in 1024pixel wide so the rest of the blank I dont need to include in my thumbnail and others have the side banners which also I dont want to show??  

- How can I set an blank image of the website is borken or has different security checks and complicated coding and so on,

This is the last piece of the puzzle.

Thanks
Awny


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