RSS feed using resized images?

I just started a photoblog and was wondering if there was any way to customize the RSS feed to embed a smaller version of the image in our posts automatically. For example, we embed fairly large photos (approx. 1200px) since the emphasis of our site is the images. We have to embed the original size into our posts to preserve EXIF data (the auto resize in WP seems to strip that info), but we’re trying to figure out a way so that our RSS feed could substitute the medium size images since we’re sending out our latest 10 posts.

Does anyone know if this is possible? You can check out our site at https://pixelsby.us/ Thanks in advance!