American Memory: Technical summary
URL for collection:
http://lcweb2.loc.gov/ammem/daghtml/daghome.html
Collection Overview
- Description
-
Portrait daguerreotypes produced by the Mathew Brady studio make up the
major portion of the collection and include political figures, such as
President James K. Polk and Thomas Hart Benton; artists, including Thomas
Cole, George Peter, Alexander Healy, and Henry Inman; and journalists,
Horace Greeley, Henry J. Raymond, and James Gordon Bennett. The
collection also features early architectural views by John Plumbe, which
include the earliest existing photographic views of buildings and
monuments in the nation's capital a few outdoor scenes, and copies of
painted portraits. The collection also includes the earliest known
portraits of President Abraham Lincoln, most likely taken shortly after
the thirty-seven year old was first elected to the U.S. House of
Representatives, and attributed to photographer N.H. Shepherd, who ran a
gallery in Springfield, Illinois, in 1846-1847.
- Source collection
- Daguerreotype Collection, Prints and Photographs
Division.
LCCN
95-861318
[Link to catalog record (z39.50 query) will
not work when main cataloging system is not available.]
.
- Technical features
-
Scenes and portraits, image quality is good.
Several items are
available in more than one digital reproduction (usually via a different
photographic intermediate). Items available in varying combinations of
image resolutions and formats. Presents challenge for
display and navigation, since alternative digital manifestations are
potentially
available for same intellectual work (or bibliographic item).
- Original material formats
-
- Number of original items
-
599 (most grayscale, some color)
- Status of collection
- Available online.
- Public access
- The Library is not aware of any restrictions on these photographs.
See notes on
rights and
restrictions provided by the Library to users of this collection.
Aids to intellectual access
- Type & granularity
- MARC bibliographic records. Each bib. record describes a single item.
Sample
bibliographic display in American Memory.
- Linking to digital reproductions
- Bibliographic record contains identifier used in filenames for all versions of image.
Last character of filename indicates image type. Some records link
(potentially, although not in current American Memory display) to
additional digital reproductions, captured from different photographic
intermediates.
Digital reproductions
Total file-space for digital reproductions:
782 Mbytes
| Photographs |
Archival image |
Service image |
Inline thumbnail |
Additional
thumbnail |
| Marker |
Filename ends "u" |
Filename ends "r" |
Filename ends "t" |
Filename ends "t" |
| Formats |
TIFF |
JPEG/JFIF |
GIF |
TIFF |
| Tonal resolution (grayscale) |
8 bit |
8 bit |
8 bit |
8 bit |
| Tonal resolution (color) |
24 bit |
24 bit |
8 bit |
8 bit |
| Spatial resolution
(approx) |
1400x1100 pixels |
1400x1100 pixels |
150x100 pixels |
150x100 pixels |
| Quantity (approx) |
~400 |
~640 |
~640 |
~530 |
| Sample |
Sample archival |
Sample
service |
Sample thumbnail |
Sample thumbnail |
Library of Congress contribution to Digital Libraries Initiative - Phase II
[Site Map]
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Technical notes:
[Documents]
[Images]
[Maps]
[Sound recordings]
[Motion pictures]
