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!