Figuring out optimal image size

I am trying to conserve on server space and would like to bring in my images at 100% size. How do I figure out what size these image placeholders are?

Hi, the link you posted is not visible (it’s a draft)…

But you can see the size of images on any web page if you use an extension like this one (Web Developer Toolbar): It’s available for Chrome and Firefox.

After you install it, you just have to click in the toolbar on the Images tab, then on “Display Image dimensions”: