Onionskin, Rice Paper, Tracing Paper
Type of Document
All documents with notable transparency and/or a glossy finish.
- Duplicate copy of correspondence
- To optimize results, do a test before applying these recommendations.
- You can choose to digitize in reflective mode alone by applying the guidelines for greyscale.
- Since this mode enables better reproduction of text, it is recommended for all documents that are either difficult to read or have poor contrast.
- Keep a border around the document to allow reframing of the document as well as later modifications (e.g., removing the scale and document number).
- For documents larger than the surface of the digital scanner, use the instructions for normal-sized artifact photography.
- For documents with several pages, consider producing a PDF document from the originals, or from black-and-white copies.
- Because of the transparency of the document, and because the grey background will bleed through, digitize the document twice using a white background: once in reflective mode, then in transparency mode at 300 ppi, with a minimum of 3,000 pixels for the longest dimensions (8 x 10, or 1:1 for formats larger than 8 x 10).
- Refer to the general guidelines to calculate the number of ppi required for a given dimension.
Note that it is the original document which measures 8 x 10, not the final digital file.
- Select 48-bit mode on the scanner to capture the maximum number of colours. If this option is not available, 24-bit mode is acceptable.
- For reference purposes, digitize a colour scale (Kodak Q-14 or Q-60) before each digitization session, to calibrate the equipment.
- In reflective mode only, digitize the document with a grey or colour scale and, depending on available space, always place the scale in the same location (ideally lower left).
- Colour-balance each image as indicated in the general guidelines. If there is no greyscale reference, balance the levels of white in the brightest zone (D-Max), then balance the black in the darkest zone (D-Min).
- Enlarge the frame by one inch at the bottom, and type the document number in black at the lower right (font: Arial, 40 pts.).
- Flatten the image (i.e., flatten layers).
- Convert both files in Adobe RGB 1998 profile, 8 bits per channel (total 24 bits), or if the document is black-and-white, convert in "Gray Gamma" 2.2, 8 bits.
- Save the image as an uncompressed TIFF, named to standards established by the Corporation's Photo Archives.
- Produce a JPEG version as described in the general guidelines.
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