Still image


Resources predominantly visual in nature, such as two-dimensional visual arts (drawing, painting, graphics, photographic prints and negatives, plans), manuscript books and archival documents, early printed books, or books printed in alphabets or fonts for which Optical Character Recognition (OCR) is cannot be implemented.

External Resources

Minimum Digitization Capture Recommendations (Association for Library Collections & Technical Services, June 2013)

DFG Practical Guidelines on Digitisation (Deutsche Forschungsgemeinschaft, February 2013)

Technical Guidelines for Digitizing Cultural Heritage Materials: Creation of Raster Image Master Files (Federal Agencies Digitization Guidelines Initiative, August 2010)

Minimum Specifications

OCR source
Print source
File type TIFF TIFF JPEG n/a n/a JPEG n/a
Resolution 400 PPI*            
Pixel array 4000 pixels on the long side            
Bit depth 24-bit RGB**            
Color space eciRGBv2 or Adobe RGB 1998            
Retention Permanent Permanent Create on ingest     Create on ingest  
Ratio 1:1            

* The resolution should be calculated from the dimensions of the object. See Samples for more information and example images.

** Whenever possible, capture at 48-bit RGB (for color, monochrome, objects with stains or marks) and save at 24–bit RGB.


The best practice is to have at least 4000 pixels on the longest edge. However, when the original object is small, as is Fig. 1, the project manager should weigh the relative benefits, considering such factors as the maximum optical resolution of the equipment, file size, and server space.

Resolution (PPI) and the resulting pixel array:

300 PPI = 922 x 1201

600 PPI = 1786 x 2366

800 PPI = 2467 x 3303

Fig. 1. [Ex Libris W.F. Hopson, New Haven] by William Fowler Hopson, 1893, 9.6 x 7.0 cm. Collection of Bookplates by William Fowler Hopson, Call # BKP 47.

Resolution (PPI) and the resulting pixel array:

300 PPI = 3554 x 3785

400 PPI = 4739 x 5047 

600 PPI = 7061 x 7522 

[Ex Libris Dr. Lucian Pfleger] by Eug. Moßgraber, 1907, 30.8 x 29 cm. Collection of Original Artwork for Bookplate Designs, Call # BKP 131.