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The screen shots above present a good walk-through on the Adobe Photoshop Express application for the iPad and iPhone.
Features for editing photos include resizing, cropping, rotating, colouring and tinting, special effects filters, a tool to straighten photos, upload to Facebook, and sending via email. Best of all it is free and available on the App store.
Verdict: Get Adobe Photoshop Express here.
Disclaimer: I am not associated or employed by any company producing software reviewed on this site.