Still Image Content
| Content | Preference | Format | Format Use | Notes | |
|---|---|---|---|---|---|
| Preservation | Access | ||||
| Still Image | |||||
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| Preferred (in order of preference |
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| Preference | Format | ||||
|---|---|---|---|---|---|
| 1 | -) | TIFF uncompressed in any color space supported by TIFF | X | TIFF 6.0 has been commonly used at Harvard for digital master images, and is considered an archival format suitable for long-term preservation. For more information about the TIFF format see see Adobe's TIFF resources. | |
| 2 | - JPEG 2000 JP2 profile with lossless compression | X | Some projects depositing content into the DRS have chosen to use JPEG 2000 for digital master images instead of TIFF. JPEG 2000 can offer storage savings - file sizes tend to be smaller and there is an opportunity to use the same file as the preservation and use copy. While JPEG 2000 is becoming more acceptable in the library community as a preservation format, there are still advantages to TIFF over JPEG 2000 for preservation. TIFF uncompressed is a simpler format internally and has more general tool support. For more information about JPEG 2000 see the JPEG the JPEG 2000 website.3 | ||
| - TIFF with CCITT T.6 (Group 4) compression | X | 4 | |||
| - JPEG 2000 JP2 profile with lossy compression | 5X | ||||
| - JPEG JFIF - ; TIFF with associated alpha component - ; TIFF with PackBits (lossless), LZW (lossless), Modified Huffman or Group 3 Fax compression | 6X | ||||
| - GIF |
Less desirable image file formats (but still accepted into the DRS):
| File Format | Suggested AlternativeX | |||
|---|---|---|---|---|
| Accepted | JPEG (non-JFIF)- | X | (suggested alternative: TIFF uncompressed - or JPEG 2000 JP2 profile with lossless compression) | |
| TIFF with JPEG (lossy) compression- | X | (suggested alternative: TIFF uncompressed - or JPEG 2000 JP2 profile with lossless compression |
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| ) |
| Usage | Codec Format | Wrappers | Notes |
|---|---|---|---|
| Preferred for Archival format | JPEG 2000* | QuickTime, MXF (MXF OP1a, OP1b operational patterns or AS-07) | Recommend lossless compression |
| Uncompressed* | QuickTime | 8 bit or 10 bit | |
| DV* | QuickTime | For digitized DV tape | |
| MPEG-2 | QuickTime | ||
| Preferred for Delivery format | H.264* | QuickTime | Any of the 21 different profiles |
| Accepted for Archival format | Avid DNxHD* | QuickTime, MXF (MXF OP1a, OP1b operational patterns or AS-07) | |
| Apple ProRes* | QuickTime |
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Video Formats for Preservation and Delivery Copies
* Harvard Library Media Preservation Services will provide reformatting services to produce these formats
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