Markdown does not allow us to specify the size of an link image.

To get around this restriction it is what I did:

1. Upload an image as usual

Stackoverflow will add these lines to your post:

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![enter image description here][1]


  [1]: http://i.stack.imgur.com/jxBxR.png

2. Change the above to an image tag

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<img src="http://i.stack.imgur.com/jxBxR.png" width="100" height="100">

Done