Images should ideally be digitized at the same resolution as they were created. Based on the source resolution, here are some common rules of thumb for selecting a scanning resolution:
|Mounted Slides and 2x2 Transparencies||4000 dpi|
Resolutions vary by the printing process, and the make and model of the printer. A good strategy is to try several resolutions, and pick the one that provides the highest quality results. Higher resolution does not automatically mean higher quality.
If possible, select a resolution that will yield image masters with a minimum height or width of 1,000 pixels. This won't always be possible, and sometimes the answer is to look for a better-quality source.
Display files should be formatted as JPEG, and thumbnail files JPEG or PNG.