Guidelines for Electronic Preservation of Visual Materials

Image Files

The table below lists the .TIF files created by the various scanning experiments described in the this document. In addition to the file name and size, a description is provided of the scanning methods used when creating the file.

Viewers can download a specific file by clicking on the file name in the table. To save time in downloading all the files, users may wish to initiate an anonymous ftp session at: ftp://ftp.loc.gov/pub/preservation/guidelines/images

File Name	Size	Sample	Notes
bio01l.tif	??K	text & engraving	original, 600 dpi, 8-bit grayscale (not available)
bio1.tif	1290K	engraving	original, 600 dpi, 8-git grayscale. Approximately 4 times actual size.
bio1_300.tif	647K	engraving	scaled to 300 dpi, first resampling method, 8-bit grayscale
bio1a3a.tif	323K	engraving	scaled to 300 dpi, nearest neighbor method, 8-bit grayscale
bio1a3b.tif	323K	engraving	scaled to 300 dpi, averaging method, 8-bit grayscale
bio1a3c.tif	323K	engraving	scaled to 300 dpi, second resampling method, 8-bit grayscale
bio1_200.tif	184K	engraving	scaled to 200 dpi, first resampling method, 8-bit grayscale
bio1a2a.tif	143K	engraving	scaled to 200 dpi, nearest neighbor method, 8-bit grayscale
bio1a2b.tif	143K	engraving	scaled to 200 dpi, averaging method, 8-bit rayscale
bio1a2c.tif	143K	engraving	scaled to 200 dpi, second resampling method, 8-bit grayscale
bio1_150.tif	81K	engraving	scaled to 150 dpi, first resampling method, 8-bit grayscale
bio1a15a.tif	81K	engraving	scaled to 150 dpi, nearest neighbor method, 8-bit grayscale
bio1a15b.tif	81K	engraving	scaled to 150 dpi, averaging method, 8-bit grayscale
bio1a15c.tif	81K	engraving	scaled to 150 dpi, second resampling method, 8-bit grayscale
b io2.tif	1813K	text	scaled to 600 dpi, 8-bit grayscale. Approximately 4 times actual size.
b1_6b.tif	161K	engraving	original, 600 dpi, binarized
b1_12b.tif	645K	engraving	scaled to 1200 dpi then binarized
b2_6b.tif	226K	text	original, 600 dpi, binarized
b2_3b.tif	57K	text	scaled to 300 dpi the binarized. Approximalely actual size.
c rd3.tif	140K	card	bibliographic card, original 600 dpi, 8-bit grayscale
crd3_3j.tif	73K	card	bibliographic card, scaled to 300 dpi, 8-bit grayscale, JPEG compressed
crd3_6b.tif	70K	card	bibliographic card, 600 dpi, binarized
crd3_3b.tif	17K	card	bibliographic card, scaled to 300 dpi, then binarized. Also has less-sensitive threshold setting resulting in dropout of low contrast.
m rt1.tif	347K	manuscript	originial, 600 dpi, 8-bit grayscale. Note variable contrast due to typewriter ribbon. Approximately 2 times actual size.
mrt1_3j.tif	129K	manuscript	scaled to 300 dpi, 8-bit grayscale, JPEG compressed
mrt1_6s.tif	174K	manuscript	300 dpi, JPEG compressed, then scaled to 600 dpi, then binarized with a sensitive threshold
mrt1_3b.tif	43K	manuscript	300 dpi, binarized with a nomal sensitivity threshold.
v rs1.tif	279K	carbon	carbon copy, original 600 dpi, 8-bit grayscale. Approximately actual size.
vrs1_3j.tif	153K	carbon	carbon copy, 300 dpi, JPEG compressed
vrs1_6s.tif	140K	carbon	carbon copy, 300 dpi, JPEG compressed, scaled to 600 dpi, then binarized with a sensitive threshold setting.