---
title: "Glossary"
canonical: "https://docs.pbs.org/space/ITS/4423734/Glossary"
format: markdown
---
|  |  |
| --- | --- |
| **Term** | **Definition** |
| > Macro (anchor)

Bounding box | The area that constrains the size of an image. *Example: 400 pixels wide by 200 pixels high.* |
| ITS | Image Transformation Service |
| ITS Storage | The image receptacle hosted by PBS |
| CDN | Content delivery network or content distribution network (CDN)<br>A system of computers containing copies of data placed at various nodes of a network. |
| > Macro (anchor)

Decorator | A series of parameters appended to the end of a url string to enable resize functionality.  *Example: .resize.380x212.jpg * |
| .crop | The url indicator that tells ITS a resize is being requested and to crop the image according to the bounding box dimensions. The crop feature crops an image from the center of the image. [Learn more](https://pbs-docs.atlassian.net/wiki/spaces/ITS/pages/4423710) |
| .focalcrop | The url indicator that tells ITS an image should be resized and cropped from an assigned focal point. [Learn more](https://pbs-docs.atlassian.net/wiki/spaces/ITS/pages/4423716) |
| .height | The numerical value for the desired height of the resized image.  *Example (height is in bold): resize.400x****100****.jpg* |
| .jpg / .png / webp | The file extensions supported by ITS.  The file extension should be written after the original image path and at the end of the decorator.  *Example (in bold):  http://image.pbs.org/demo/filename.****jpg****.resize.380x212.****jpg**** * |
| Managed Image | An image hosted by ITS |
| > Macro (anchor)

Mezzanine Image | A very large, high resolution image that is at least 1920 pixels wide x 1080 pixels high with a 16:9 ratio. |
| Namespace | A logical grouping of image files and where those files are located. Must be requested from a PBS User. |
| .resize | The url indicator that tells ITS a resize is being requested and to keep the image aspect ratio intact.  *Example: resize.400x100.jpg* |
| .width | The numerical value for the desired width of the resized image. *Example (width is in bold): resize.****400****x100.jpg* |