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*Text-based | Archival Master File | Optical capture resolution | Bit depth | Embedded color/gray profile | Notes *Image specs optimized for OCR |
Printed computer documents | Uncompressed TIFF v.6 | 300-400 PPI | 8/24 | Adobe RGB (1998)/Gray Gamma 2.2 | Size of text should be considered when determining resolution |
Typed documents | Uncompressed TIFF v.6 | 300-400 PPI | 8/24 | Adobe RGB (1998)/Gray Gamma 2.2 | Size of text should be considered when determining resolution |
Printed publication matter | Uncompressed TIFF v.6 | 300-400 PPI | 8/24 | Adobe RGB (1998)/Gray Gamma 2.2 | Size of text should be considered when determining resolution |
Printed matter on microform | Uncompressed TIFF v.6 | *3500 PPI | 8 | Gray Gamma 2.2 | *Accounts for magnification ratio |
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This standard defines best practices for creating reference images, digitizing text-based material that is slated for Optical Character Recognition (OCR) processing, either immediately after digitization or at some point in the future. These standards prioritize legibility and can be made using automated devices, such as flatbed or orbital scanners.
While material digitized according to these standards will often be in fairly robust condition, it may be vulnerable due to inherent vice in the medium (such as brittle paper or deterioration of a film substrate). Conservation assessment is recommended prior to digitization.
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