Hum, I would like to do the same, but that's not easy to me (I am not a developer).
I tried adding a href link inspired from zenpage theme, something like :
̀```if (isImagePhoto()) {
$tburl = getFullImageURL();
?>
[img]<?php echo html_encode(pathurlencode(getDefaultSizedImage())); ?>[/img]" style="max-width:<?php echo getDefaultWidth(); ?>px"/>
```
But the link gives me a blank page first ! After F5, I get the full image as expected.
If someone can tell me what I miss or what is wrong here, that would be very nice.
BR.