Hmm. In view of this, I would like to request a lighter penalty for the fellow user here, perhaps a reminder rather than a strike. Given that his .jpg images are actually relevant and much bigger in resolution. And he may not be clear with the image policy before uploading the relevant images.
I've done the necessary conversion and will be adding up the updates thereafter.
That would sound great and less harsh on newcomers. We should try implementing that and see how the situation goes. It'll be really great if we could gain new contributors on the long run with the revised rules.