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Technical Metadata profile for scanned paper documents

Technical Metadata profile for scanned paper documents

May 28, 2018

Technical metadata profile draws on two sources: TIFF metadata guidelines from digitizationguidelines.gov and TIFF tags supported by the LOC.

IMPORTANT NOTE: The column for the serial number (labeled 'S. No.') in the following tables is not intended to convey any ordering or hierarchy among the metadata labels/properties. It is there to provide easy references while discussing the metadata profile with the team.

TIFF- Metadata

S. No.LabelPropertyRangeUsageExampleObligationComments
1Imagetechnical.imageImage

1
2Timestamp of scanningtechnical.scanDateTime
The time when this image was scanned. Use the value in the tiff:timestamp field as the creation and modification dates appear to be unreliable.2011-03-04T14:12:52-05:001Convert the date to EDTF format
3Scannertechnical.scannerScanner

1
5Rows per Striptechnical.rowsPerStrip
The number of rows per strip. This is the number of rows in the image of one strip when an image is divided into strips. With JPEG compressed data this designation is not needed and is omitted.1-1000-1
6Endiantechnical.endian
The Byte Order (also known as endianness) describes the sequence or order of bytes.lsb, MM0-1
7Orientationtechnical.orientation
The image orientation viewed in terms of rows and columns.TopLeft, TopRight0-1


Image

S. No.LabelPropertyRangeUsageExampleObligationComments
1ImageWidthtechnical.image.width
The number of pixels per row36161Typical scanner size
2 ImageLengthtechnical.image.length
The number of rows of pixels in the image44181Typical scanner size
3BitsPerSampletechnical.image.bitsPerSample
Number of bits per component

Grayscale

24-bit color

1

8

24

4 Compressiontechnical.image.compression
Compression scheme used on image data

None

CCITT group 4

1

Uncompressed

4

5 PhotometricInterpretationtechnical.image.photometricInterpretation
The color space of the image data.

min-is-black

RGB.

1Additional color spaces are possible: CMYK (5), YCbCr (6), CIE L*a*b* (8), and others.
6 SamplesPerPixeltechnical.image.samplesPerPixel
The number of components per pixel

1

3

1

Grayscale

24-bit RGB color

7 XResolutiontechnical.image.xResolution
Horizontal pixel count per resolution unit (inches, centimeters)4001240 ppi: Rational data type - 240 pp(unit) is often displayed this way
8 YResolutiontechnical.image.yResolution
Vertical pixel count per resolution unit (inches, centimeters)4001300 ppi: see above
9 ResolutionUnittechnical.image.resolutionUnit
Unit of measurement for X and Y Resolution (pixels per inch or centimeter)

PixelsPerInch

PixelsPerCentimeter

1None: pixel is irregularly shaped
10ColorSpace technical.image.colorSpace
sRGB specification

sRGB

uncalibrated

1

1

65536

11ExtraSamplestechnical.image.extraSamples
Description of extra components

0 = Unspecified data

1 = Associated alpha data (with pre-multiplied color)

0-1Associated alpha is generally interpreted as true transparency information.
12Background colortechnical.image.backgroundColor
Background color of the image that has been scanned. white, black, gray0-1
13Border colortechnical.image.borderColor
Border color of the image that has been scanned. srgb, gray0-1
14Matte colortechnical.image.matteColor
Matte color of the image that has been scanned. grey, gray0-1
15Transparent colortechnical.image.transparentColor
Transparent color of the image that has been scanned. balck, gray0-1


Scanner

S. No.LabelPropertyRangeUsageExampleObligationComments
1Scanner Maketechnical.scanner.make
The scanner manufacturerSinar0-1Simple ASCII text string
2Scanner Modeltechnical.scanner.model
The scanner model name or number54H0-1Simple ASCII text string
3Scanner Softwaretechnical.scanner.software
Name and version of the software package(s) used to create the imageStokes Software Inc. IWS - Version 02.04.01.010-1Simple ASCII text string

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