Preservation

Standard Distribution PDF [IMG-D3]

Record Type
Expected Use Distribution Copy
Product Name Standard Distribution PDF [IMG-D3]
Product Purpose

These PDF distribution files are cropped versions of the preservation or reproduction master files with the targets and other non-essential data removed for better visual presentation

Nature of Source Material

Any digital preservation or reproduction master file smaller than 2500 ppi x 3300 ppi

File Properties Data Format

PDF Final product can be single page or multi-pages

Version 1.4

Capture Information

The image is always presented as a positive image regardless of its original polarity

Typical file size (for 1 page in color): 24 MB

Other Information

The image does not contain targets and other references.

Quality Control Quality Assurance and Quality Control for Digital Imaging Products

The Digitization Services Branch’s Quality Assurance and Quality Control (QA/QA) program is evolving as new tools and resources are acquired and implemented. We are moving towards more automated and integrated systems to assure the products we make meet the specifications outlined. Digital products created by the Digitization Services Branch are validated against standardized format specifications and signature files when possible. We use a variety of format specific batch evaluation and validation tools both open source and vendor supplied, to assure technical quality level specifications are met. All files, but especially distribution system specific files, are inspected for successful playback in a variety of tools and environments. Additional quality control workflows are in development.

Equipment/System Evaluation
NARA implements scheduled service and calibration protocols according to manufacturer recommendations as well as on an "as needed" basis.

Metadata
Embedded metadata: NARA is working on embedded metadata guidelines for all file types.
Technical metadata: NARA is finalizing technical metadata schemas for all file types.

Customer Level Evaluation / Order Completeness

NARA is developing an in house job tracking order system to better coordinate work at the Branch level.

Item Level Evaluation: Automated File Characteristics Analysis
Fixity: NARA is evaluating workflows to create and validate checksums for each digital file.

Rationale

Currently, the digital distribution copy options are generally the same for all still images regardless of the format of the original source material.

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