The following guideline is an executive summary of minimum practice of digitizing process. The purpose of this standard being suggest was to control the quality of digitizing documentation for the office.
(a) BUSINESS DOCUMENTS:
Documents with text or graphics for which colour is either not present or not essential
- 300dpi, bi-tonal, format PDF or multi-page TIFF;
- Provide OCR for PDF searchability wherever practical
Documents where colour is present and is important, or for documents with low contrast (e.g. faded text, coloured background)
- 300dpi, 24 bit colour, format PDF or multi-page TIFF
- Provide OCR for PDF searchability wherever practical
(b) BOOKS FROM THE COLLECTIONS
- Format: single page TIFF (preservation), PDF, TIFF or JPEG (access)
- Minimum 300dpi; 24 Bit colour
- Provide OCR for PDF searchability wherever practical
- Capture covers, spine and all pages wherever possible
- Capture the entire page wherever practical
In cases where fine detail exceeds the limitation of 300dpi, or when fine detail is deemed to be of significance to the item, endeavour to capture at 600dpi irrespective of the object size.
(c) PHOTOGRAPHS
- Format: TIFF, 8 bit greyscale (BW photographs) or 24bit colour (colour photographs),
- Resolution Larger than A5 minimum 300dpi while Smaller than A5, minimum 600dpi
- Typical exceptions
- Where colour is significant to record the condition of BW photographs, increase to 24 bit colour
- Where photographs are very faded or very dark, increase bit depth to 16 bits per channel (16 bit greyscale or 48bit colour) to facilitate image restoration.
- Enlargements and contact prints derived from large format negatives may have sufficient resolution to warrant resolution to a minimum of 600dpi
Photographic negatives and transparencies
- Format: TIFF, 8 bit greyscale (BW) or 24bit colour (colour),
- Resolution: 3200 dpi
- Typical exceptions
- Where photographs are very faded or very dark, increase bit depth to 16 bits per channel (16 bit greyscale or 48bit colour) to facilitate image restoration.
(d) MAPS AND POSTERS
Format: Single page TIFF, 24 bit colour
Resolution: Minimum 300dpi, increase to 600dpi if sufficient fine detail is required on the advice of the collection manager.
(e) THESES – PH.D, MASTERS, HONOURS
- File formats: TIFF (archive), PDF (delivery)
- Documents with text or graphics for which colour is either not present or not essential
- 300dpi, bi-tonal
- Greyscale (8 bit) for pages with tonal images (e.g. BW photographs)
- Greyscale (8 bit) for pages with faint text to maintain legibility (e.g. faded typewritten documents)
- Documents where colour is present and is important, or for documents with low contrast (e.g. faded text, coloured background): 300dpi, 24 bit colour
These standards should be applied to maximise readability and minimise file size, so the use of an appropriate combination of bi-tonal, greyscale & colour within a thesis is recommended wherever practical.
Updated:: 04/10/2016
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