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Selecting an appropriate image file format & specification specification
Source material characteristics / type | preferred image file formats (in preference order) 1 | preferred image capture resolutions (in preference order) | ||||||||||||||||
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Machine printed black and white text documents
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Printed or handwritten documents with color content
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Works of art, color photographs
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Monochromatic, black and white photographs, or continuous tone black and white images |
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NOTE: ALL COLOR AND CONTINUOUS TONE BLACK & WHITE IMAGES should include embedded ICC display profiles, (e.g., sRGB, eciRGB, AdobeRGB, sGray).2 |
Optical Character Recognition (OCR) and keyed text files
For digital objects that include page-images and searchable text, the Harvard Digital Repository Service (DRS) requires deposits include one UTF-8 encoded plain text file for each corresponding page-image file. The text file could be obtained from an OCR software or keyed. Optionally, ALTO layout xml file for each image could also be included.
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├── 013814337
├── 013814337_0001.tif
├── 013814337_0001.txt
├── 013814337_0001.xml
├── 013814337_0002.tif
├── 013814337_0002.txt
├── 013814337_0002.xml
├── 013814337_0003.tif
├── 013814337_0003.txt
├── 013814337_0003.xml
├── 013814337_0004.tif
├── 013814337_0004.txt
├── 013814337_0004.xml
├── 013814337_0005.tif
├── 013814337_0005.txt
├── 013814337_0005.xml
Naming and organizing files
Prior to or after scanning documents, one needs to decide how to organize the information so that it can be easily navigated in digital form. Documents have their own organizational structure (individual titles, volumes, issues, chapters, etc.). These meaningful structural components of the scanned documents need to be reflected in the organization of the sequentially numbered scanned page-images arranged within named directories.
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[ITEM_ID] ← this is the parent directory for the title. | | ---- [ITEM_ID]_[VOLUME_ID] ← this is the directory for the volume. | ---- 000652831_v001_0001.jpg | ---- 000652831_v001_0002.jpg | ---- 000652831_v001_0003.jpg | ---- 000652831_v001_0004.jpg | ---- 000652831_v001_0005.jpg | ... | ---- 000652831_v001_0099.jpg | |---[000652831_v002] | | ---- 000652831_v002_0001.jpg | ---- 000652831_v002_0002.jpg | ---- 000652831_v002_0003.jpg | ---- 000652831_v002_0004.jpg | ---- 000652831_v002_0005.jpg | ... | ---- 000652831_v002_0099.jpg
Considering to have files deposited into DRS
We strongly recommend repositories to consider depositing outsourced and acquired digital content into Harvard Digital Repository. You can find detailed information about Harvard DRS, including storage fees, on this LTS "DRS & Delivery Services" wiki page.
Imaging Services offers services of depositing outsourced and acquired digital content into Harvard Digital Repository for Harvard repositories. Please consult our "Deposit Born-digital Content" page.
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Technical Guidelines for Digitizing Cultural Heritage MaterialsAnchor fadgi fadgi
Article: What is embedded color profile information?Anchor fnote_embedded_icc fnote_embedded_icc
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