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File types and encoding
preferred media formats and compression settings

The following recommendations are directed at a diverse population of Windows and Mac users on campus, as well as an off-campus audience with broadband and dial-up connections. These recommendations support the creation of digital materials for teaching and learning, and do not address preservation.

Audio
on-campus

Format	Codec	Bitrate	Delivery	Mime type Extension
QuickTime	QDesign	160 kbps	stream or progressive download	audio/quicktime .mov
MP3*	MP3	160 kbps	stream or progressive download	audio/mpeg3 .mp3

off-campus

Format	Codec	Bitrate	Delivery	Mime type Extension
MP3*	MP3	96 kbps	progressive download	audio/mpeg3 .mp3

*Faculty who need MP3 audio for electronic reserves (ERes) should contact Scores and Recordings, x3899, which will seek copyright clearance and control access to the files through its ERes system.

Video
on-campus

Format	Codec	Frame size	Bitrate	Frame rate	Delivery	Mime type Extension
QuickTime	H.264	640x480	800-1200 kbps	15 fps	stream or progressive download	video/quicktime .mov

Images
This chart displays recommendations for image capture methods with output to the screen. A few notes:

An archival copy file should be saved for most images.
Always save scans as TIFFs.
The quality settings referenced below are from Photoshop.
Faculty who need PDFs for electronic reserves should contact the library, x3852, which will seek copyright clearance and control access to the files through its ERes system. The library does not provide other assistance with PDFs.

Media type	Capture method	Capture resolution	Archival format	Screen format size/quality	Mime type, Extension
b/w text document	flatbed scanner or digital camera	1-bit, 600 dpi	TIFF	PDF*	application/pdf .pdf
photos, illustrations, maps, manuscripts, etc.	flatbed scanner or digital camera	8-bit grayscale or 24-bit color 300 dpi at original image size	TIFF	JPEG 150x150 pixels 780x470 1000x610 1250x870	image/jpeg .jpg
35mm b/w & color slide or negative	slide scanner	24-bit color 3000 pixels (longest side)	TIFF	JPEG 150x150 pixels 780x470 1000x610 1250x870	image/tiff .tif

6/3/04