ATTACHMENT 5
TIFF IMAGE FILE HEADER INFORMATION
The Library requires that "typical" or "expected" data be provided for most TIFF tags (normally, the data supplied by software default settings). The tags the Library has been using are listed below. Exceptions or options that may not conform to "typical" or default data are noted in the comments column.
Description | Tag | Comments |
NewSubfileType ImageWidth ImageLength BitsPerSample Compression PhotometricInterpretation StripOffsets SamplesPerPixel RowsPerStrip StripByteCounts DocumentName Artist |
254 256 257 258 259 262 273 277 278 279 269 315 |
actual pixel count actual pixel count pathname (directory name and file name) as used for delivery of image Library of Congress date and time scanned |
5.1
TIFF header: tags 282, 283, and 296
The Library has used varying approaches for the 282, 283, and 296 tags. For a large number of grayscale digital images that reproduce photographs, the following tags were used:
XResolution YResolution ResolutionUnit |
282 283 296 |
actual pixel count actual pixel count 1 (no unit specified) |
In previous contracts for printed matter scanned directly from paper, the following values appeared in these same tags:
XResolution YResolution ResolutionUnit |
282 283 296 |
scanning resolution scanning resolution 2 |
In other cases, the Library has received TIFF images for which no values have been supplied for these tags.
It is possible that certain printing anomalies (like "postage stamp" printing are due to the specific values placed in these TIFF header tags.
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