How do I edit my own picture so it is formatted to the correct size to be used as a wallpaper on my iPhone 4?

The Big Bang Theory
The Big Bang Theory

I got this e-mail from a friend!

How do I edit my own picture so it is formatted to the correct size to be used as a wallpaper  on my iPhone 4?

I wanted to tell him to use Google, but instead I decided to write this quick blog post. Let’s see first what Apple has to say about the iPhone 4 screen to get an overview:

  • Retina display
  • 3.5-inch (diagonal) widescreen Multi-Touch display
  • 960-by-640-pixel resolution at 326 ppi
  • 800:1 contrast ratio (typical)
  • 500 cd/m2 max brightness (typical)

The iPhone 4 and the iPhone 3Gs have completely different pixel resolution. The  iPhone 3GS has a resolution  of 480×320 pixel and iPhone 4 has a pixel resolution of 960×640.  The answer is to  use your favorite software  to crop your image to 640 X 960 and you should get a reasonable enough looking custom wallpaper!

If you are looking for a free editing tool give Gimp  (windows) a try. I edited the above promotion picture for the TV show The Big Bang Theory to the correct size as an example – for the iPhone 4. Try it on your iPhone and let me know what you think!


John Ryan

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