Dumb SEO Questions

(Entry was posted by Stephen Hamilto on this post in the Dumb SEO Questions community on Facebook, 08/24/2017).

I have a question that falls into image or technical SEO

I have a question that falls into image or technical SEO...

Our CMS creates URL parameters for images based on the dimensions of the image. As different sized image are automatically created for different purposes, we end up with multiple URLS that are identical, except for the URL parameters e.g.

?width=100 & height=100
?width=500 & height=500
?width=1000 & height=1000

I have two questions:
1. If all of these are allowed to be crawled, is this duplicate content? (I think the answer is "Yes", but I want to check).
2. Assuming the answer to the above is "Yes", just how big of an issue is this? I`m trying to work out if this is a critical problem we should fix immediately, or is it typically a lower priority issue?

Any advice/tips/guidance from folks more experienced in this area would be hugely appreciated. :)
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    View original question in the Dumb SEO Questions community on Facebook, 08/24/2017).