Sample calendar page
1200 pixels wide X 900 pixels high
3" high X 4" wide at 300 dpi
16.667" wide X 12.5" high at 72dpi
(all three of these are actually the same size)
Most photo-editing software will allow for someone to crop and size their image to the above specifications, although it's important that a photo is never sized "up" to be bigger than the original that came out of the camera. You can go smaller, you just can't go bigger.
Remember to send your photos in priority order (1 to 5) to firstname.lastname@example.org by August 2, 2013. If you have more than one kitty, please feel free to have more than one kitty in the photo. If you have a special request for a date in the calendar, be sure to note that too,. and we'll do our best to put your picture on that date.