Resolution is the density of detail in an image expressed in terms of pixels per inch (ppi). Higher resolution means better quality prints and increased capacity for enlargement. But it also means larger file sizes that are more costly to create and more difficult to manage.
The options for resolution are Standard and High.
Our Standard Resolution is very high-quality to begin with - 600dpi for photos, and 3000ppi for most slides/negatives, and is suitable for slide shows, email & web applications, and photo-quality printing, as well as archiving and enlarged photo-quality printing.
Our High Resolution is for large format printing and high-end graphics work. Our high resolution service is most relevant for slides and negatives (4000ppi) - although 1200dpi resolution is available for prints as well. More resolution gives you reserve should you need to zoom in or enlarge a portion of an image. Also, note that an image's resolution can easily be reduced, but it can never be increased without rescanning.
For relative file sizes for different resolution, compression levels, and image formats, please refer to the resolution table.