Difference between revisions of "Digitization Guidelines"
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* work in progress | * work in progress | ||
The German Science Foundation issued a set of guidelines for the | The German Science Foundation issued a set of guidelines for the digitization of documents.<ref>[[media:Praxisregeln_Digitalisierung_Maerz_2007_DFG.pdf]]</ref> | ||
In the following you find | In the following you find a relevant subset of the DFG guidelines and, in addition, a description of a workflow for digitizing and submitting digital documents for digital collections maintained by the MPDL. | ||
== Scanning == | |||
== Resolution and Image Quality == | === Resolution and Image Quality === | ||
For scanning greyscale or | For scanning greyscale or colored prints a minimum resolution of 300 dpi is suggested. Documents containing handwriting or maps with fine lines and small descriptions might require a scan resolution of up to 400 dpi. | ||
For generating bitonal scans, 600 dpi are requested. | For generating bitonal scans, 600 dpi are requested. | ||
== Colour depth == | === Colour depth === | ||
Bitonal scans (b/w) are generated with a | Bitonal scans (b/w) are generated with a color depth of 1 level (1 bit) per pixel. Greyscale images are digitized with 256 levels (8 bit = 1 byte) per pixel. Color images use 3 color channels (red, green, blue) with 1 byte per channel (= 24 bit = 3 byte per pixel), enabling 256 x 256 x 256 = 16.7 million colors per pixel. | ||
24 bit provide a sufficiently high | 24 bit provide a sufficiently high color depth for color scans. Scanning with 48 bit color depth makes sense only in few cases where images need to be corrected or reworked after the scanning process. | ||
Revision as of 10:37, 17 March 2008
* work in progress
The German Science Foundation issued a set of guidelines for the digitization of documents.[1]
In the following you find a relevant subset of the DFG guidelines and, in addition, a description of a workflow for digitizing and submitting digital documents for digital collections maintained by the MPDL.
Scanning[edit]
Resolution and Image Quality[edit]
For scanning greyscale or colored prints a minimum resolution of 300 dpi is suggested. Documents containing handwriting or maps with fine lines and small descriptions might require a scan resolution of up to 400 dpi. For generating bitonal scans, 600 dpi are requested.
Colour depth[edit]
Bitonal scans (b/w) are generated with a color depth of 1 level (1 bit) per pixel. Greyscale images are digitized with 256 levels (8 bit = 1 byte) per pixel. Color images use 3 color channels (red, green, blue) with 1 byte per channel (= 24 bit = 3 byte per pixel), enabling 256 x 256 x 256 = 16.7 million colors per pixel. 24 bit provide a sufficiently high color depth for color scans. Scanning with 48 bit color depth makes sense only in few cases where images need to be corrected or reworked after the scanning process.