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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. There are
emerging formats which may be superior in some ways to these supported
standards. We will endorse new formats as browsers and players mature to fully support them
in our environment.
Note that these recommendations support the creation of
digital materials for teaching and learning. They do not
address issues of 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 |
Sorenson 3 |
480x360 |
800-1000 kbps |
15 fps |
stream or progressive download |
video/quicktime
.mov |
off-campus
| Format |
Codec |
Frame size |
Bitrate |
Frame rate |
Delivery |
Mime type
Extension |
| MPEG-1 |
mpeg1 |
320x240 |
250-500 kbps |
15 fps |
progressive download |
video/mpeg
.mpg |
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 when working with Digitization Services or any other
campus production center.
- 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
|
|
|
Archival
format
|
Screen format
size/quality
|
|
|
b/w text document
|
flatbed scanner or digital camera
|
1-bit,
600 dpi
|
|
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
|
|
JPEG
150x150 pixels
780x470
1000x610
1250x870
Quality: High (60)
|
image/jpeg
.jpg |
|
35mm b/w & color slide or negative
|
slide scanner
|
24-bit color
3000 pixels
(longest side)
|
|
JPEG
150x150 pixels
780x470
1000x610
1250x870
Quality: High (60)
|
image/tiff
.tif
|
*PDF files for ERes are created by Reserve Services. Digitization Services is available to create other PDF files.
See the
Production Services page of this document for more information.
Image Pan/Zoom
There are a number of proprietary imaging technologies which offer pan/zoom as a feature. Please contact the Digitization Center, x4954, for more information.
ds 6/3/04
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