Building apps for the iPhone 4’s Retina display means building two sets of images—one at 163ppi and another at 326ppi. After slugging our way through an app build or two, we feel confident that we have a decent workflow for attacking future Retina display app designs. Hopefully this information is of use to other designers.

We’ve been working very hard on the next update to Consume for iPhone, which adds support for the iPhone 4’s Retina display.
I love my Drobos, but I don’t love the bundled software’s icon. Rather than complain, I’ve created a replacement.
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Adding subtle noise or texture to UI elements can look great, but what’s the best way to do it?

Forget about big-ticket features. What Photoshop needs is some finely tuned, pixel accurate love.
This is my Photoshop CS6 wish list. If you have something you think might be worthy for this list, please @me (if I add it, I’ll credit you). I’ll send this article to John Nack in the next few days. Hopefully Adobe find the information useful. Who knows, they may even implement some of the suggestions.
We’ve been working on some new Bjango web pages. As part of that process, we drew an iPhone from scratch. We thought others might like to use the new images, too.
Do whatever you like with these images, as long as you don’t sell them or claim them to be your own work. Feel free to use them on your own website or modify them in any way.
The iPhone 4 features a vastly superior display resolution over previous iPhones, containing 614400 pixels, quadruple the iPhone 3GS’s 153600 pixel display. The screen is the same physical size, so those extra dots are used for additional detail—twice the detail horizontally, and twice vertically.
For developers only using Apple’s user interface elements, most of the work has been done for you. For those with highly custom, image-based interfaces (like all of our apps), a fair amount of work will be required scaling up elements to take full advantage of the iPhone 4’s Retina display.
Rounded rectangles, or roundrects as QuickDraw so fondly calls them, are standard fare on a web and interface designer’s utility belt. So common that the footer on this page itself contains 12 roundrects. So common that it’s rare for web pages or apps to not contain a roundrect or two.
Unfortunately, pixel-locked rounded rectangles can actually be fairly difficult to draw in Photoshop. (Pixel-locked, meaning all edges fall on an exact pixel boundary, creating the sharpest object possible.)
Design articles
Designing for the Retina display
An iPhone 4, without the queue
What to do with all those extra pixels?
Using Photoshop for iPhone development
Testing landscape app interfaces
How many layers are in my Photoshop doc?
App Store articles
The settings used to be in the Settings app
Mobile and portable app store round-up
Bjango articles
2009: Our first year as Bjango
The moon phase during the moon landing
About the author
Marc Edwards (@marcedwards) is the Director & Lead Designer at Bjango.
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