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Scanning Standards

The following standards were used during digitization:

Text (Books)

Image Types

Bit Depth

Color Space

Resolution (ppi)

Scale

File Format

B&W Text Only

1-bit

Bitonal

600dpi

100% (1:1)

Tiff (uncompressed or lossless compression no LZW)

B&W Text with illustrations (photos, drawings, plates, charts)

8-bit

Grayscale

600ppi

100% (1:1)

Tiff (uncompressed)

Texts w/ Continuous-Tone Images & Photos (color)

24-bit

RGB

600ppi

100% (1:1)

Tiff (uncompressed)

Book Scanning

Bitonal
Crop text to include a solid white background with a uniform margin. Save only the text. Erase black spots created by stains or notes on the original page unless the note is a valuable part of the content.

Grayscale

  • In the case of a page that includes both text and an image, crop the scanned image to include the outline of the book as well as a uniform black border.
  • In the case of a page that is just a plate, crop the scanned image so that there is no border--just the page itself.
  • In the case of a document such as a map or a deed, crop the image with a uniform black border

RGB color
Use only where the color is an integral part of the content. Crop scanned image to include a uniform black margin from the felt surface of the Zeutchel table.