improving the resolution of images on iPhone 4 from 72ppi to 326ppi

I've been exploring ways to improve the quality of buttons in my mobile design. Currently, my navigation buttons are in a 72ppi PNG sprite and I also have another set at 326ppi. I've heard that iPhone4 can automatically choose the higher resolution image by adding @x2 to the sprite's name. However, I'm a bit confused on how my current 194x343px @ 72ppi navigation sprite can be transformed into a 335x1469px @ 326ppi image.

If anyone has any helpful advice or guidance on this process, it would be greatly appreciated.

Kyle

iphonehtmlcss

Answer №1

After researching, I discovered a way to create a customized stylesheet specifically for the iPhone 4 by utilizing this method. All you need is a @media query to target the device.

@media only screen and (-webkit-min-device-pixel-ratio: 2) {
    /* Styles for iPhone 4 */
}

If you prefer linking to an external stylesheet, you can use:

<link rel="stylesheet" media="only screen and (-webkit-min-device-pixel-ratio: 2)" type="text/css" href="../iphone4.css" />

Answer №2

If you want your button to look sharp and clear on both normal and retina displays, make sure to include two versions of the image in your project. Start by adding a file named button.png with dimensions 194x343px for regular screens. Then, create a second image with dimensions 388x686px (double the size) and save it as doubled-button.png. Link these images in Interface Builder to ensure your app automatically switches to the higher resolution version when running on a retina display.

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