ARCHE - external wiki

h1. Editing File Metadata

Many file formats support storing metadata in a dedicated header section. This can be enriched or altered.

Tools:

* ExifTool: https://exiftool.org {{collapse(How To)

h3. Change value of a tag

* List of tags exiftool supports: https://exiftool.org/TagNames/index.html

For example change the value of the EXIF tag 'Artist'. With Windows cmd line.

# open cmd line (press Windows+R, type cmd and press enter)

# in cmd line navigate to folder containing exiftool executable

# to find the name of the tag you want to change, firs list metadata with actual tag names (use -s flag)

<pre>exiftool -s ..\..\..\Documents\tmpStuff\bieber_PC_OeNB\042_OeNB_1904-1a.tif</pre>

This gives

<pre><code class="shell">

ExifToolVersion                 : 11.86

FileName                        : 042_OeNB_1904-1a.tif

Directory                       : ../../../Documents/tmpStuff/bieber_PC_OeNB

FileSize                        : 10 MB

FileModifyDate                  : 2019:07:18 13:33:42+02:00

FileAccessDate                  : 2020:02:13 10:41:31+01:00

FileCreateDate                  : 2020:02:13 10:41:31+01:00

FilePermissions                 : rw-rw-rw-

FileType                        : TIFF

FileTypeExtension               : tif

MIMEType                        : image/tiff

ExifByteOrder                   : Little-endian (Intel, II)

SubfileType                     : Full-resolution image

ImageWidth                      : 2263

ImageHeight                     : 1515

BitsPerSample                   : 8 8 8

Compression                     : Uncompressed

PhotometricInterpretation       : RGB

Model                           : Microbox GmbH - Book2Net

StripOffsets                    : 272596

SamplesPerPixel                 : 3

RowsPerStrip                    : 4294967295

StripByteCounts                 : 10285335

XResolution                     : 400

YResolution                     : 400

ResolutionUnit                  : inches

Software                        : High Performance Image Library, (c) Michael Girke 2008

ModifyDate                      : 2016:08:29 15:44:31

Artist                          : Ísterreichische Nationalbilbiothek, Wien

ProfileCMMType                  : Apple Computer Inc.

ProfileVersion                  : 2.4.0

ProfileClass                    : Input Device Profile

ColorSpaceData                  : RGB

ProfileConnectionSpace          : Lab

ProfileDateTime                 : 2010:05:28 10:51:13

ProfileFileSignature            : acsp

PrimaryPlatform                 : Microsoft Corporation

CMMFlags                        : Not Embedded, Independent

DeviceManufacturer              :

DeviceModel                     :

DeviceAttributes                : Reflective, Glossy, Positive, Color

RenderingIntent                 : Perceptual

ConnectionSpaceIlluminant       : 0.9642 1 0.82491

ProfileCreator                  : Unknown (LOGO)

ProfileID                       : 0

ProfileCopyright                : Copyright by LOGO GmbH, Steinfurt

ChromaticAdaptation             : 1 0 0 0 1 0 0 0 1

RedMatrixColumn                 : 0.38354 0.14978 0

GreenMatrixColumn               : 0.57959 0.83546 0.01984

BlueMatrixColumn                : 0.00107 0.01474 0.80507

MediaWhitePoint                 : 0.9642 1 0.82491

MediaBlackPoint                 : 0 0 0

RedTRC                          : (Binary data 1034 bytes, use -b option to extract)

GreenTRC                        : (Binary data 1034 bytes, use -b option to extract)

BlueTRC                         : (Binary data 1034 bytes, use -b option to extract)

AToB0                           : (Binary data 221806 bytes, use -b option to extract)

AToB2                           : (Binary data 221806 bytes, use -b option to extract)

AToB1                           : (Binary data 221806 bytes, use -b option to extract)

ProfileDescription              : 1910044_28-05-2010_1

ImageSize                       : 2263x1515

Megapixels                      : 3.4

</code></pre>

# To change value of 'Artist' type: (see https://exiftool.org/#writing for details)

<pre>exiftool -Artist="Oesterreichische Nationalbibliothek, Wien" ..\..\..\Documents\tmpStuff\bieber_PC_OeNB\042_OeNB_1904-1a.tif</pre>

# Now check the result

<pre>exiftool -s ..\..\..\Documents\tmpStuff\bieber_PC_OeNB\042_OeNB_1904-1a.tif</pre>

This gives 

<pre><code class="shell">

...

Artist                          : Oesterreichische Nationalbibliothek, Wien

...

</code></pre>

# Done!

* For applying this on all files in one folder:

<pre>exiftool -Artist="Oesterreichische Nationalbibliothek, Wien" ..\..\..\Documents\tmpStuff\bieber_PC_OeNB</pre>

* For applying this on all files in one folder with subfolders:

<pre>exiftool -r -Artist="Oesterreichische Nationalbibliothek, Wien" ..\..\..\Documents\tmpStuff\bieber_PC_OeNB</pre>

h4. Note

UTF-8 does not seem to work properly (although it might only be the case for EXIF tags).

* Workflow for testing can be found here: https://exiftool.org/forum/index.php?topic=5011.0

* In Windows cmd

** change codepage to utf-8

<pre>chcp 65001</pre>

** then execute steps as above but with -charset utf8

<pre>exiftool -charset utf8 -Artist="Österreichische Nationalbibliothek, Wien" ..\..\..\Documents\tmpStuff\bieber_PC_OeNB\042_OeNB_1904-1a.tif</pre>

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