Above is my first iPhone/iTouch wallpaper, which was created from my animated music video ‘Dead All Along.’ I’ve added a wallpaper section to my website so that I can add more free wallpapers for download.

The following is an easy tutorial on how to render out stills from your After Effects film and create great looking wallpapers for an iPhone or iTouch, by taking advantage of the iPhone and iTouch native resolution.

Technical Info

An iPhone and iTouch both have display sizes of 320x480px, at 2:3 aspect ratio and a resolution of 163ppi. After Effects renders out stills at 72ppi. So to ensure that the film frames look as good as possible on the small iPhone and iTouch screens we simply have to render out a larger still image from After effects at a 2:3 aspect ratio and then resize in Photoshop. The larger After Effect image needs to be 2.26388889 times (163 divided by 72) larger than the iPhone/iTouch display and use a composition size of 724 x 1086.

Steps

1. With your scene selected in After Effects, change the Composition Settings (composition–>settings) so that the width and height are 724 by 1086 (see screenshot below)

2. Move the camera, and possibly props/characters to ensure the composition is still good
3. Render out the single frame as a PNG sequence
4. Open the png render in Photoshop and resize the image’s Resolution setting (Image–>Image Size) to 163 making sure to deselect the ‘Resample Image:’ check box (see screen shot below)

5. Save the image
6. Lastly, two optional steps you can perform to increase the quality of your image are to increase the Saturation (Image–>Adjustments–>Hue/Saturation) and apply an Unsharp Mask (Filter–>Sharpen–>Unsharp Mask). The amount is dependent upon the image so you will probably have to fiddle and test the results.