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PALMM Guidelines for Digitizing Master TIFF Images
KBA-01633-T4R7
Purpose & Scope
These guidelines indicate recommended requirements for master TIFF image files scanned from printed source documents for PALMM projects.
Procedure

TIFF files created through a process of scanning are archived as masters and used to derive other file formats for Web delivery.

Specifications:

e Format:

ITU TIFF (Tagged Image File Format)

Encoding:

6.0 (ITU T.6) 
Specification: TIFF 6.0 Specification(PDF file version)

Compression:

Uncompressed

Bit-depth:

Appropriate to the source document and for intended uses (e.g., facsimile reproduction)

DPI:

Appropriate to the source document and for intended uses (e.g., high resolution printing, optical character recognition, etc.)

Scale/Image Dimensions:

Scan scaled to 100% of source document dimensions

Color Space:

sRGB
Scanning software calibrated to standard RGB palate


Process:

No single method of scanning is recommended. Any method appropriate to the source document and the intende duses of the electronic image may be acceptable.  Compliance with the principles and recommendations of Moving Theory into Practice: Digital Imaging for Libraries and Archives (Anne R. Kenney and Oya Y. Rieger [Mountain View, CA: Research Libraries Group, 2000]) and Cornell University's Digital Imaging Tutorial are highly recommended.

For optimal image capture, periodic calibration of scanning devices and monitors is recommended.  Both Moving Theory into Practice and Cornell University's Digital Imaging Tutorial: Quality Control provide additional information. In addition, use of scanners supporting automatic calibrarion (of reflected or transmitted light) is a part of image prever and scanning is highly recommended.

Use of standard gray-scale or color bar is recommended for capture of photographic images; images from transmissive sources (i.e., slides, photo-negatives, transparencies, etc,); and other works originally rendered for shading or color content.

Capture of the image as found is highly recommended. Image manipulation (e.g., application of Gaussian blur) should be limited to secondary processing, preferably after the native scan has been saved and only in preparation for JPEG derivation.

 

Quality Control:

Quality control should play a prominent role in scanning operations.  Visual inspection together with a query of the file header should be completed by spot check.  Spot check requires inspection of every image in thumbnail view and of no less than 10% of the images in full-image view.

A variety of factors effecting on-screen and print legibility should be examined.  For additional guidance, we recommend reading Cornell University's Digital Imaging Tutorial: Quality Control.

Additional Documentation
Environment