If I have a photo library that takes up x GB of space in my Aperture 3 library, can I calculate how much space space it will take up on an iPad 2? I've read that images larger than 2304 x 1536 are optimized, and that Aperture lets you set the threshold lower than that, but I don't know how that relates to file size. I have about 4,500 photos in my library, which are a mixture of photos shot with a 3 Megapixel camera and an 8 Megapixel camera on the highest-resolution JPEG setting, and 300 DPI scans manipulated in Photoshop Elements and saved as maximum-resolution TIFF files. I don't plan to store music or more than a couple videos on my soon-to-be purchased iPad 2, and I don't need to have my entire Aperture library on it, but I would like to have some idea of what to expect in terms of photo-library size. I'm thinking that a 16 GB iPad 2 will be enough for me. What are other people's experiences with the iPad and photo libraries?