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Guidelines for Derived JPEG Thumbnails
KBA-01636-M4Q0
Purpose & Scope

These Guidelines indicate requirements for web-deliverable JPEG thumbnails derived from JPEG2000 images. Thumbnail images can be created by DigiTool automatically as an Ingest Task when loading JPEG2000, JPEG, and PDF images. If the library is generating thumbnails directly, the following specifications are recommended.

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.

Additional Documentation
Environment