Yes, the only way to zoom in is to save and view the picture with the gallery.
I use Mighty Text, which allows me to use my laptop to send and receive text, but it seems that if my phone has a problem with the message, it does not forward it to my computer. I needed to send it to my e-mail through my phone, and then it showed up in Mighty Text on my laptop, or I could have accessed it via e-mail.
Still, it was a photograph of a screen. Can you imagine how much less popular I would be if I posted stuff like this:
(that was far more work than taking a screen shot!)