How do I save an electronic version of a photographic image?
Digital images (either directly from a digital camera or other imaging device or from scanned photographs) should be saved as a Tagged Image Format File (TIFF). You should save the image at the size you intend it to be reproduced and ensure that the image is of sufficient resolution. The resolution of a computer monitor is 7296 dots per inch (dpi) and while an image may look perfect on screen it is often of insufficient resolution for print. For adequate reproduction, files should be saved at 250300 dpi (bear in mind that if you subsequently change the size of a digital image you will also change the resolution). Do not use higher resolutions, these will not improve the quality of your image but will produce very large files.