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blocks:app-note:deepzoom [2021-08-28 14:25] – typos and minor tweaks adminblocks:app-note:deepzoom [2026-02-19 07:34] (current) – Added note about the new Deep Zoom block type admin
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 =====Deep Zoom===== =====Deep Zoom=====
 +
 +:!: **IMPORTANT**: This application note is obsolete. It has been superseded by the Deep Zoom block type introduced in Blocks 7.5, which is now the recommended method for accomplishing this functionality. That block also lets you combine deep zoom with other blocks appearing at selectable zoom depths as well as navigation to/from the Deep Zoom block.
 +----
  
 The term "deep zoom" refers to the ability of displaying extremely high resolution images in a way that allows you to zoom into the image using pinch and pan gestures on a touch screen. This can be used to show, for example, a large map where you can zoom in to read fine print or see other details. It's based on a [[https://en.wikipedia.org/wiki/Pyramid_(image_processing)|pyramid representation]] of the original image, dividing it up into multiple layers of increasing resolution. This arrangement makes it possible to handle images that are too large to be managed as is. The term "deep zoom" refers to the ability of displaying extremely high resolution images in a way that allows you to zoom into the image using pinch and pan gestures on a touch screen. This can be used to show, for example, a large map where you can zoom in to read fine print or see other details. It's based on a [[https://en.wikipedia.org/wiki/Pyramid_(image_processing)|pyramid representation]] of the original image, dividing it up into multiple layers of increasing resolution. This arrangement makes it possible to handle images that are too large to be managed as is.
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   * Type //java -version// and press enter.   * Type //java -version// and press enter.
  
-If this command isn't recognized, you need to [[https://adoptopenjdk.net|download and install]] Java before proceeding. If a version number is shown, make sure it's version 8 or later.+If this command isn't recognized, you need to [[https://adoptopenjdk.net|download and install]] Java before proceeding. If a version number is shown, make sure it's version 8 or later. You should also make sure the JAVA_HOME enviroment variable is set on the computer (at least on windows). If it is not you cannot just type java in the terminal, you will have to use the full path to java everytime you use it.  Use google to see how to do that.  
  
 Then go ahead and {{:blocks:app-note:deep-zoom:pyramiddzitool.zip|download this program}}. This is an open source (public domain) command line program, kindly provided by the National Institute of Standards and Technology. More details can be found [[https://github.com/usnistgov/pyramidio|here]]. Then go ahead and {{:blocks:app-note:deep-zoom:pyramiddzitool.zip|download this program}}. This is an open source (public domain) command line program, kindly provided by the National Institute of Standards and Technology. More details can be found [[https://github.com/usnistgov/pyramidio|here]].
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 <code> java -Xms1G -jar pyramidio-cli.jar --tileSize 510 -i hr.jpg -o out</code> <code> java -Xms1G -jar pyramidio-cli.jar --tileSize 510 -i hr.jpg -o out</code>
  
 +Be patient, it takes a minute or so. You will se this message in the terminal while the process is running:
 +<code> INFO: Making directory archiver for out </code>
 To process another image, just copy the file to the same directory as the tool and change //hr.jpg// in the command to the name of your new file. The result will end up in the //out// directory, prefixed with the source image file name. Avoid using spaces or non-ASCII characters in the file name.  To process another image, just copy the file to the same directory as the tool and change //hr.jpg// in the command to the name of your new file. The result will end up in the //out// directory, prefixed with the source image file name. Avoid using spaces or non-ASCII characters in the file name.