Life in LoFi: iPhoneography | iPhone Photo News, Showcases, App Reviews

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It’s not if the iPhone camera can make large prints, it’s how big….

Whether to mount and frame as gifts, for sale or for gallery exhibition, more and more prints are being made from iPhones. Prints and enlargements can be made from any iPhone camera. How big an enlargement you can make depends on a number of factors — the iPhone model you use, the resolution of the apps you use, and if, how and where you are willing to resample your images.

iPhone Photo Print Sizes and Resolutions

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You can get good quality prints from any iPhone. While most photo sharing is done online these days, all iPhones have very print-friendly resolutions, including the early 2 megapixel cameras of the 2G and 3G.

One very important factor in printing images is image size — the number of pixels in your image — how they are used differently for screen and print. An image that looks great on your screen may not have enough data or pixels to print as well. That’s why it’s always best to work with the largest image and the most pixels possible.

The table above shows recommended maximum print sizes at various resolutions. With current photo and inkjet printing methods, anything over 300 pixels per inch (ppi) will be overkill. Personal experience has taught me that you’ll still get great results with all but the most detailed, intricate images at 200 ppi. Depending on the photo, you’ll get good images at 150 ppi, but depending on the image, you may start to see a noticeable increase in blur in the details.

Keep in mind that large images are usually viewed from a few feet away. This will help to disguise any blurriness or artifacts that enlarging the images creates.

Although you can do it, I don’t recommend printing photos at resolutions lower than 150 ppi. Some photos will still look fine at that resolution, but you still run a high risk of fuzzy photos. Also at low resolution, pixelization can occur, where lines and curves don’t look smooth, but look stair-steppy and blocky (the “jaggies”).

Many apps, especially older apps, free apps and “lite” apps greatly reduce the resolution of your images, no matter which iPhone you use to shoot them. Most commercial apps have been updated to support at least 1600x1200px images. Life In LoFi’s iPhone Photo App Compatibility feature is a great resource and shows the maximum output resolution of over 130 300 popular (and some not-so-popular) apps and is updated regularly. An excellent free app to keep tabs on what other photo apps are doing to your image resolution is PhotoSize by Danny Goodman.

If you’re outputting oversized prints — anything larger than 8-1/2″ x 11″ — be sure you have enough pixels to make a good looking enlargement. You may want to resample your images to add pixels for enlargement. You can’t add detail — if it isn’t in the original photo, it isn’t going to be in a larger, resampled one. But good and careful image resampling can help reduce image pixelization or jaggies.

To resample images on your iPhone, there are currently several good tools to do so. Filterstorm can resize iPhone 4S images up to 4062×5416 pixels — thats a whopping 22 megapixels! Resize-Photo does a very good job of resizing images, as does the resize tool in Iris Photo Suite. If you choose to use a desktop or laptop computer and have Photoshop or a similar image editing program, the Bicubic or Bicubic Smoother algorithms will give you the best results. If you do a lot of image enlargement on your desktop or laptop, I also recommend onOne Software’s Perfect Resize (formerly Genuine Fractals) plugin for Photoshop.

For best results, start with the largest image possible. The larger your original image is, the sharper your resampled image will be. Limit your upsampling to 200%. For printing, never downsample your master files — there is no good reason to.

Small iPhone Photo Print Sizes and Resolutions

It’s very difficult to get small images to enlarge and print well and it’s almost impossible to do with 320×480 output.

All iPhones produce images that enlarge well. Some iPhones create better images than others for enlargement, as do many apps. If you stay within suggested guidelines, you should be able to output — either at home or at a photo lab — a wide variety of print sizes that will look great.

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Related Links:

Filterstorm ( )

Iris Photo Suite ( )

Resize-Photo ( )

PhotoSize ( )

Updated 12.02.11 @18:50: Updated the story for iPhone 4S, Genuine Fractals name change, and the greatness of Filterstorm.