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user_documentation:metadata [2018/03/23 19:22]
executive [What's all this 'metadata' stuff, anyway?]
user_documentation:metadata [2019/03/23 10:15] (current)
executive [What's all this 'metadata' stuff, anyway?]
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 ====== Metadata ====== ====== Metadata ======
  
-|  This is an advanced topic. If you are new to Piwigo, you should take the [[http://piwigo.org/ext/extension_view.php?eid=776|tour]] first   |+<WRAP center info round 60%>This is an advanced topic. If you are new to Piwigo, take the [[http://piwigo.org/ext/extension_view.php?eid=776|tour]] before reading this.</WRAP>
  
 ==== What's all this 'metadata' stuff, anyway? ==== ==== What's all this 'metadata' stuff, anyway? ====
- 
-This is an advanced topic. If you are a new to Piwigo, you should take the [[http://piwigo.org/ext/extension_view.php?eid=776|tour]] first. 
  
 Metadata is information about information. An example would be the album and artist information contained in the ID3 tag of an MP3 song file. In the case of image files, this includes things such as height and width, as well as Exif and IPTC blocks, which are written to a file when a digital camera takes a photo. Also, additional metadata can be written to the image file later in software, such as keywords. Metadata can be useful to the software you use, as well as to humans. Images may contain so called Exif and IPTC tags (one or both). Metadata can be used with many different types of file formats (JPEG, TIFF, RAW etc.). Metadata is information about information. An example would be the album and artist information contained in the ID3 tag of an MP3 song file. In the case of image files, this includes things such as height and width, as well as Exif and IPTC blocks, which are written to a file when a digital camera takes a photo. Also, additional metadata can be written to the image file later in software, such as keywords. Metadata can be useful to the software you use, as well as to humans. Images may contain so called Exif and IPTC tags (one or both). Metadata can be used with many different types of file formats (JPEG, TIFF, RAW etc.).
-The future of metadata will likely be decided by [[https://en.wikipedia.org/wiki/Metadata_Working_Group|Metadata Working Group]]+The future of metadata will likely be decided by [[https://en.wikipedia.org/wiki/Metadata_Working_Group|Metadata Working Group]] Other examples of image metadata are ICC color profiles, and Extensible Metadata Platform (XMP), the successor to IPTC.
  
 === Basic metadata === === Basic metadata ===
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 ==== Expanding Piwigo's Metadata Capabilities ==== ==== Expanding Piwigo's Metadata Capabilities ====
  
-** Note:** For some functions, in may be necessary to install [[http://piwigo.org/ext/extension_view.php?eid=199|Grum Plugin Classes]]+** Note:** For some functions, in may be necessary to install [[http://piwigo.org/ext/extension_view.php?eid=199|Grum Plugin Classes]]. Also, the metadata available to you depends on the version of PHP your server uses. 
 +(Recommended as of Mar-2018: version 5.6)
  
 Firstly, it helps to learn exactly what metadata your images contain, and what Piwigo can access. Fortunately, your standard Piwigo installation already has a tool to inspect some of your Exif and IPTC image metadata. Copy any sample jpeg image to this path: (it must have this file name) Firstly, it helps to learn exactly what metadata your images contain, and what Piwigo can access. Fortunately, your standard Piwigo installation already has a tool to inspect some of your Exif and IPTC image metadata. Copy any sample jpeg image to this path: (it must have this file name)
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 ([[user_documentation:use:features:conf_locale| Using the LocalFiles Editor]])\\ \\  ([[user_documentation:use:features:conf_locale| Using the LocalFiles Editor]])\\ \\ 
-Using the method above has limitations. 'show_iptc' and 'show_exif' fetch metadata at the time when an image is displayed only. The metadata was not integrated into the Piwigo database, therefore it cannot be used for searching and other functions. For many people, //displaying// information such as focal length, shutter speed etc. is sufficient, however metadata such as keywords, titles etc. are very useful for functions such as sorting and searching. This section describes how you can get more use from your IPTC metadata by adding it to the Piwigo database.+Using the method above has limitations. 'show_iptc' and 'show_exif' fetch metadata at the time when an image is displayed only. The metadata was not integrated into the Piwigo database, therefore it cannot be used for searching and other functions. For many people, //displaying// information such as focal length, shutter speed etc. is sufficient. However metadata such as keywords, titles etc. are very useful for other purposes, such as sorting and searching. This section describes how you can get more use from your IPTC metadata by adding it to the Piwigo database.
  
-Copying metadata into the Piwigo database takes place during the synchronisation step. If you [[user_documentation:learn:add_picture|added images]] to Piwigo using the built-in web interface, this should happen automatically for you. However, there are many different ways to add images, and sometimes the synchronisation step is missed. You will then need to perform it manually. (Administration → Tools → Synchronise ] Also, the changes in this section will only affect images that are imported from that point in time forward. To extract metadata from previously imported images, you need to run the synchronisation step.+Copying metadata into the Piwigo database takes place during the synchronisation step. If you [[user_documentation:learn:add_picture|added images]] to Piwigo using the built-in web interface, this should happen automatically for you. However, there are many different ways to add images, and sometimes the Synchronization step is missed. You will then need to perform it manually. (Administration → Tools → Synchronise ] Also, the changes in this section will only affect images that are imported from that point in time forward. To extract metadata from previously imported images, you need to run the synchronisation step.
  
  
 
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user_documentation/metadata.1521832965.txt.gz · Last modified: 2018/03/23 19:22 by executive
 
 
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