Image archiving obviously requires some scanning including alteration of resolution. The standards set to preserve digital collections often compress the images. Digital archiving and scanning standards that are used extensively are listed below.
1. Scanning TIFF images
Genuine photographs will be scanned by setting the dpi at 300 if the size is larger than 5x7in. If it is a smaller one then 600 dpi can be used to keep the resolution alive. Text items will be processed using 600 dpi while slides and negatives require a higher 2400 dpi for proper output. TIFF’s from digital photographs are saved at 100 dpi. Some of the TIFF images are too large to process in one go. In such cases the process is divided and after digitizing merged into a single file.
2. JPEG Scanning tips
If picture contains non text items then 100 dpi is enough while text included one require 300 dpi. The same may not be feasible in the case of a world map where the text may be too small to be read. In such cases metadata from the TIFF format is properly used. JPEG images require an enhancement in the fields of contrast and color. Digital documentation techniques come handy at this point.
3. Detailed information including Meta data
An optimized GIF image is stored in the server in case if the content is too large to be properly exhibited. This GIF will be linked to the metadata in the form of Larger View or Detailed view so that viewers will be able to get a clear lossless form of the original content if required.
TIFF images which were archived earlier using digital archiving services are processed according to the metadata included with them. The guidelines are modified to allow newer items with less content to be allowed online.
For digital documentation and archiving, it is vital that you select the best service provider.