Location

Willis Library 3rd Floor, Room 370

Contact Us

Lab Phone: (940) 369-7809

Office Phone: (940) 891-6746

FAX: (940) 369-8882

Standards

Scanning Standards by Type of Material

 

Digital image collections incorporated into the UNT Libraries' permanent collections must adhere to the minimum requirements given below.  Depending on the specific objectives of the projects, higher resolutions may be desirable for some materials.  Please note that this document is not intended to address all technical issues and does not describe the details of operational procedures.  See project-specific guidelines for further information.

Text (Books)

Image Types Bit Depth Color Space Resolution (ppi) Scale File Format
           
B&W Text Only  1-bit Bitonal 600ppi 100% (1:1) Tiff (uncompressed or lossless compression no LZW)
B&W Text with Illustrations (Photos, Drawings, Plates, Charts)  8-bit Grayscale 400ppi 100% (1:1) Tiff (uncompressed)
Text w/ Continuous-Tone Images & Photos (Color) 24-bit RGB 400ppi 100% (1:1) Tiff (uncompressed)
           

Documents (Handwritten, Ledgers, Receipts)

Image Types Bit Depth Color Space Resolution (ppi) Scale File Format
           
B&W Text Only*  1-bit Bitonal 600ppi 100% (1:1) Tiff (uncompressed or lossless compression no LZW)
Handwritten Documents, Ledgers  8-bit Grayscale 400ppi 100% (1:1) Tiff (uncompressed)
Correspondence, Letters 24-bit RGB 400ppi 100% (1:1) Tiff (uncompressed)
           

 * We recommend scanning handwritten documents in grayscale or color.

 Photographs (Prints)

Image Types Bit Depth Color Space Resolution (ppi) Scale File Format
           
B&W Photographs   8-bit Grayscale 600ppi 100% (1:1) Tiff (uncompressed)
Color Photographs 24-bit RGB 600ppi 100% (1:1) Tiff (uncompressed)
           

*As of April, 2009, we scan both sides of a photograph even if one side is blank. 

Photographs (Negatives and Slides)

Image Types Bit Depth Color Space Resolution (ppi) Scale File Format
           
B&W Negatives & Slides   8-bit Grayscale 5000 pixels across the longest side* 100% (1:1) Tiff (uncompressed)
Color Negatives & Slides 24-bit RGB 5000 pixels across the longest side* 100% (1:1) Tiff (uncompressed)
           

 * Not sure how to figure 5000 pixels across the longest side?  Download a film sizes guide.

 * For copy negatives, scan the entire negative.  Do not crop to the original image.  Do not crop out written notes.

Large Format (Posters and Maps) Above 17 x 24 inches (A2)

Image Types Bit Depth Color Space Resolution (ppi) Scale File Format
           
B&W Maps/Posters   8-bit Grayscale 5000 - 10000 pixels across the longest side 100% (1:1) Tiff (uncompressed)
Color Maps/Posters 24-bit RGB 5000 - 10000 pixels across the longest side 100% (1:1) Tiff (uncompressed)