iPhoneographer Dixon Hamby recently posted this to his blog:
If you want to make quality prints from your images, before you buy an iPhone photo app check to see if it saves at 100%. Many of the most popular ones don’t. After you download an app check the settings. Even though the app saves at 100% the default may be less than full resolution. I simply don’t use an app unless it saves at 100%. Why would I want to degrade the image? So if you ever plan to make prints, print calendars or books, check before you buy and save yourself some money.
Editor’s Note: Well said, Dixon. Thanks! Even if you’ve read a review of an app online, it’s always a good idea to read the app’s entire description in iTunes. If it’s mentioned, many times a developer will bury the size of output at the end of a description. Not all online reviews mention an app’s resolution (LifeInLoFi’s policy is to mention image resolution when we find lower than acceptable output. Often we mention the resolution anyway.). If no output resolution is mentioned in the online review you read — either full-size or reduced — check the user reviews in the App Store. Many times, the early reviews will mention low res output.
Dixon Hamby publishes the blog dixon hamby iphoneography and has given me permission to republish his post here. You can follow Dixon on Twitter, @dixonhamby. You can purchase books of his iPhoneography here.