iTunes connect screenshot and icon details

Some simple guidelines on the sizes/resolution for screenshots and icons for iTunes connect, when you submit your app.

For all images

• Minimum 72 DPI
• RGB color space

Large app icon

• 1024x1024 (cannot be scaled up, but can be scaled down)
• File format: jpg tif or png 
• Keep it "flat" as in the new guidelines. Avoid rounded corners.

3.5" Retina Screenshots

• Portrait: 960x640 or 960x600
• Landscape: 640x960 or 640x920
• File format: jpg or png

4" Retina Sreenshots 

iPhone 5/iPod touch (5th gen)

• Portrait: 1136x640 or 1136x600
• Landscape: 640x1136 or 640x1096
• File format: jpg or png

iPad Screenshots

• Portrait: 1024x768, 1024x748, 2048x1536 or 2048x1496 
• Landscape: 768x1024, 768x1004, 1536x2048, or 1536x2008
• File format: jpg or png

Do the screenshots on a device and you should be all good to go.

For more details on the content of the screenshots and icons read this document: https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/iTunesConnect_Guide.pdf