Apple - How do I "copy image address" in iOS?
Tap, and hold the image; then choose "copy," open a new browser window, and paste into the address bar.
Neither iOS Safari nor Opera Mini support this option. However, you can install the 'view source' iOS bookmarklet, as explained here:
- http://fettig.net/weblog/2007/07/02/view-source-for-safari-on-iphone/
And use it to look for the image link within the source you are visiting.
This may be cumbersome using older iOS versions, but it is much easier on iOS 4.2, using the 'Find text on webpages' feature which allows you to search for text using Safari's Search field (right of the navigation bar) to look for image extensons like .jpg, .png and .gif.