I've posted this before, but here it is again.
When you email images from the iPad you have a choice of image quality/size: Small, Medium, Large, and Actual. Here is a quick list I made for myself to keep track of what each size means in terms of pixels. It’s not a complete list. I’ve been negligent about keeping it up to date and no longer have some of the devices handy for testing.
Screen Shot on Retina iPad (3rd generation and later)
- Small = 320 x 240
- Medium = 640 x 480
- Large = 1366 x 1024
- Actual = 2048 x 1536
Camera on iPad (3rd gen) thru iPad Air
- Small = 320 x 240
- Medium = 640 x 478
- Large = 1296 x 968
- Actual = 2592 x 1936
- Small Sq = 320 x 320
- Medium Sq = 640 x 640
- Large Sq = 1280 x 1280
- Actual Sq = 1936 x 1936
* Sq = the new Square aspect mode that came out with iOS 7
** I’ve removed the information for the iPad 2. It was obviously wrong, once I started to think about it, and I have no way to go back and figure out how I got it wrong.