| Master | Access* | Thumbnail** | |
| File Format | TIFF | JPEG | JPEG |
| Bit Depth | 1 bit bitonal 8 to 16 bit grayscale 48 bit color |
8 bit grayscale 24 bit color |
8 bit grayscale
24 bit color |
| Spatial Resolution | Adjust scan resolution to produce a minimum pixel measurement across the long dimension of 6,000 lines for 1 bit files and 4,000 lines for 8 to 16 bit files | 150 - 200 ppi | 144 ppi |
| Spatial Dimensions | 4000 - 6000 pixels across the long dimension | 600-800 pixels across the long dimension | 160 x 120 pixels (CONTENTdm specification) |
| Master | Access* | Thumbnail** | |
| File Format | TIFF | JPEG | JPEG |
| Bit Depth | 16 bit grayscale 48 bit color |
8 bit grayscale 24 bit color |
8 bit grayscale 24 bit color |
| Spatial Resolution | 400 to 800 ppi | 150-200 ppi | 144 ppi |
| Spatial Dimensions | 4000 to 8000 pixels across the long dimension, depending on size of original, excluding mounts and borders | 600-800 pixels across the long dimension | 160 x 120 pixels (CONTENTdm specification) |
| Master | Access* | Thumbnail** | |
| File Format | TIFF | JPEG | JPEG |
| Bit Depth | 16 bit grayscale 48 bit color |
8 bit grayscale 24 bit color |
8 bit grayscale 24 bit color |
| Spatial Resolution | 600 ppi 300-400 ppi for larger maps |
150 to 200 ppi | 144 ppi |
| Spatial Dimensions | 6000 to 8000 pixels across the long dimension | 1078 pixels across the long dimension | 160 x 120 pixels (CONTENTdm specification) |
| Master | Access* | Thumbnail** | |
| File Format | TIFF | JPEG | JPEG |
| Bit Depth | 16 bit grayscale 48 bit color |
8 bit grayscale 24 bit color |
8 bit grayscale 24 bit color |
| Spatial Resolution | 600 to 800 ppi | 150 to 200 ppi | 144 ppi |
| Spatial Dimensions | 6000 to 8000 pixels across the long dimension, excluding mounts and borders | 600-800 pixels across the long dimension | 160 x 120 pixels (CONTENTdm specification) |
This document was adapted from the BCR's Collaborative Digitization Program's
general guidelines for scanning. For more in-depth information concerning this
topic
please refer
to the following source:
BCR's CDP Digital Imaging Best Practices Version 2. (2008).
URL:
http://mwdl.org/public/mwdl/digital-imaging-bp_2.0.pdf (4
March 2011).
Adopted by the Digital Advisory Committee of the Southeastern NY Library Resources
Council, February 5, 2009
* CONTENTdm can generate your access images for you. You can set up your project so that the software will create either JPEG or JPEG2000 files from your TIFFs. If you want to upload an image to HRVH that has more than 800 pixels across the long dimension then the JPEG2000 format is a better choice.
** CONTENTdm will generate thumbnails for your image files upon importing
into the system. If you want to create a custom thumbnail for non-image files
(PDFs,
Audio,
Video, etc.) instead of using CONTENTdm's generic thumbnails then they need
to be no bigger than 160 x 120 pixels.