Preservation

Artifact Median [ART-R1]

Record Type Objects and Artifacts
Expected Use Reproduction Master
Product Name Artifact Median [ART-R1]
Product Purpose

The purpose of this product is to respond to reference and reproduction requests.

Nature of Source Material

Any 3-D Original

File Properties Data Format

TIFF, version 6.0 (.tif)
Uncompressed

Capture Information

Bit Depth

  • 24-bit RGB
  • 48-bit RGB optional

Spatial Resolution

  • 10 - 16 megapixels
  • Higher than 16 megapixels optional

Typical file size With 16 megapixel camera: 50 MB
With 39 megapixel camera: 117 MB. (IDS reformatting labs typically use 39 MP cameras.)

Other Information
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.

For additional QC protocols for products created on the Zeutschel Camera System, please see Quality Assurance and Quality Control for Digital Products Created on the Zeutschel Camera Systems

Rationale

The Photographic Imaging, Microfilm and Textual Preservation Lab uses the uncompressed TIF file format for preservation master files for all the record types it processes. Currently, NARA does not use JPEG 2000 or other means of compression in preservation master files, including LZW compression within TIF files.

Reproduction master files can be either uncompressed TIF or JPG if compression is required.

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