Standard Distribution Image [IMG-D1]
|Expected Use||Distribution Copy|
|Product Name||Standard Distribution Image [IMG-D1]|
The purpose of these files is to respond to reference requests for files with targets and other non-essential data removed for better visual presentation.
|Nature of Source Material||
|File Properties||Data Format||
Depending on project needs, the follow file formats are options:
If derived from a preservation or reproduction master file:
If captured directly from source object:
Typical file size (8.5" x 11"): ~ 43 MB
When captured at 4000 lines or higher, this product satisfies the NARA Enhanced Scan option on the NARA Reproduction Fee Schedule.
The image does not contain targets and other references.
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.
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
Currently, the digital distribution copy options are generally the same for all still images regardless of the format of the original source material.