Digital Imaging Best Practices

DIGITAL IMAGING BEST PRACTICES Version 2.0 • June 2008 Bibliographic Center for Research Collaborative Digitization Program

Digital Imaging Best Practices OVERVIEW Digital Imaging Best Practices:  offer guidance   to provide digital imaging recommendations for institutions and collections that are planning / involved in digitization projects. It is a guide, not de facto standard, for digital imaging,  image capture, presentation, storage and preservation. Source: Bibliographic Center for Research Collaborative Digitization Program http://www.bcr.org/cdp/best/digital-imaging-bp.pdf

Digital Imaging Best Practices SCOPE: WHAT IS ADDRESSED IN CDP DOCUMENT Digitizing and file format recommendations for:   Text, photographs, maps, graphic materials, artwork and 3-D objects, film and born-digital files Suggested hardware configurations  Software considerations  Quality control  File naming conventions  Scanner and monitor calibration  Targets and color bars  Storing images 

Digital Imaging Best Practices SCOPE What is not addressed in CDP document:  Scanning and file format recommendations for:   Audio, video/moving images  Project management  Selection of collections for digitization

Digital Imaging Best Practices PHOTOGRAPHS Master Access Thumbnail File Format TIFF JPEG JPEG Bit Depth 16 bit grayscale 8 bit grayscale 8 bit grayscale 48 bit color 24 bit color 24 bit color Spatial 400 to 800 ppi 150 to 200ppi 144ppi Resolution Spatial 4000 to 8000 600 pixels 150 to 200 Dimensions pixels across the across the long pixels across the long dimension, dimension long dimension depending on size of original, excluding mounts and borders

Digital Imaging Best Practices TEXT Master Access Thumbnail File Format TIFF JPEG JPEG Bit Depth 1 bit bitonal 8 bit grayscale 8 bit grayscale 8 to16 bit 24 bit color 24 bit color grayscale 48 bit color Adjust scan resolution to Spatial 150 to 200ppi 144ppi produce a minimum pixel Resolution measurement across the long dimension of 6000 lines for 1 bit files and 4,000 lines for 8 to 16 bit files. Spatial 4000 to 8000 pixels 600 pixels across 150 to 200 pixels Dimensions across the long the long dimension across the long dimension dimension

Digital Imaging Best Practices MAPS Master Access Thumbnail File Format TIFF JPEG JPEG Bit Depth 16 bit grayscale 8 bit grayscale 8 bit grayscale 48 bit color 24 bit color 24 bit color Spatial 600ppi 150 to 200ppi 144ppi Resolution 300 to 400ppi for larger maps Spatial 6000 to 8000 1078 pixels 150 to 200 Dimensions pixels across the across the long pixels across the long dimension dimension long dimension

Digital Imaging Best Practices GRAPHICS Master Access Thumbnail File Format TIFF JPEG JPEG Bit Depth 16 bit grayscale 8 bit grayscale 8 bit grayscale 48 bit color 24 bit color 24 bit color Spatial 600 to 800 ppi 150 to 200ppi 144ppi Resolution Spatial 6000 to 8000 600 pixels 150 to 200 Dimensions pixels across the across the long pixels across the long dimension, dimension long dimension excluding mounts and borders

Digital Imaging Best Practices METADATA Descriptive Metadata  Metadata that describes the intellectual content of a resource and  used for the indexing, discovery and identification of a digital resource. Administrative Metadata  Metadata that includes management information about the digital  resource, such as ownership and rights management. Structural Metadata  Metadata that is used to display and navigate digital resources and  describes relationships between multiple digital files, such as page order in a digitized book or diary. Technical Metadata  Metadata that describes the features of the digital file, such as  resolution, pixel dimensions and hardware. The information is critical for migration and long-term sustainability of the digital resource. Page 33

Digital Imaging Best Practices GENERAL PRINCIPLES & SUMMARY Digitize at the highest resolution appropriate to the source material  Digitize at an appropriate level of quality to avoid redigitizing and  rehandling of the originals in the future Digitize an original or first generation (i.e., negative rather than print)  of the source material to achieve the best quality image possible. In the case of art prints, the developed print is considered the original piece. Create and store a master image file that can be used to produce  surrogate image files and serve a variety of current and future user needs Use system components that are nonproprietary 

Digital Imaging Best Practices GENERAL PRINCIPLES & SUMMARY Use image file formats and compression techniques that  conform to standards within the cultural heritage community Create backup copies of all files on servers and have an off-  site backup strategy Create meaningful metadata for image files or collections  Store digital files in an appropriate environment  Monitor data as necessary  Document a migration strategy for transferring data across  generations of technology Plan for future technological developments 

Digital Imaging Best Practices FOR MORE INFORMATION BCR’s CDP Digital Imaging Best Practices Version 2.0 June 2008 http://www.bcr.org/cdp/best/digital-imaging-bp.pdf or http://bit.ly/NVRd (capitalization counts)

Digital Imaging Best Practices

by Minnesota Historical Society on Mar 26, 2009

Accessibility

Categories

Upload Details

Usage Rights

1 Embed 10

Statistics

Digital Imaging Best Practices — Presentation Transcript