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PALMM Guidelines for Digitizing Derived JPEG Images
KBA-01634-D2D1
Purpose & Scope
These Guidelines indicate recommended requirements for web-deliverable JPEG image files derived from master TIFF image files created for PALMM projects.
Procedure
Specifications:

File Format:

JPEG (Joint Photographic Expert Group)
Specification: ISO 10918-1/2

Encoding:

Standard

Compression:

Minimum (highest image quality)
Not greater than 15% (image quality not less than 85% of source file)

Bit-depth:

Same as source file

DPI:

Same as source file

Scale/Image Dimensions:

Width = 100 pixels; Height = variable
Maintain original image aspect ratio

Interpolation:

Resample


Process:

No single method of processing is recommended. However, whether converting images individually or by batch process, a 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