Image Renditions

Target:

What is the Image Renditions?

Details:

What is the Image Renditions?

Is a new concept to SharePoint 2013 .The basic purpose of image renditions is to offer differently sized versions of images uploaded into SharePoint. To take advantage of this useful feature, you need to be working on a site with publishing features enabled, and also have BLOB caching enabled for your web application.

When using image renditions, your image will be cropped and resized according to a handful of preset sizes, including any custom sizes you create. You can then further customize how each image is cropped and resized for each rendition, and add those versions of the image to the page. In past versions of SharePoint, it was possible to resize an image on a page; however, the image’s file size remained the same no matter how large or small the image actually displayed on the page. Image renditions aren’t just the original image displayed smaller or larger. They are entirely unique image files stored on the SharePoint server’s hard drive. When image renditions are configured, SharePoint automatically crops and sizes the original image to the specified dimensions and saves those files as individual images on the hard drive. Those newly created images are then referenced back to the original image.

To enable the BLOB cache:

1-    Start >> Computer and navigate to the following directory: C:\inetpub\wwwroot\wss\VirtualDirectories.

2-    Open the folder of the web application in which BLOB caching will be enabled.

3-    Open the web.config file in Notepad or another editor.

4-    Press Ctrl+F to open the Find dialog and type <BlobCache.

5-    Press Enter to perform the search, which brings up the following line:

<BlobCache location="C:\BlobCache\14" path="\.(gif|jpg|jpeg|jpe|jfif|bmp|dib|tif|tiff|themedbmp|themedcss|themedgif|themedjpg|themedpng|ico|png|wdp|hdp|css|js|asf|avi|flv|m4v|mov|mp3|mp4|mpeg|mpg|rm|rmvb|wma|wmv|ogg|ogv|oga|webm|xap)$" maxSize="10" enabled="false" />

6-    At the end of the line, change enabled="false" to enabled="true".

7-    Save the web.config file.

Demo: Using Image Rendition

1-    Add image to image Library.

2-    Create page in page library "ImageRenditionsPage.aspx".

3-    Insert S4.jpg image in this page.

4-    Click the Settings menu >> Site Settings.

5-    Under the Look and Feel header, click Image renditions. (If you don’t have the BLOB cache enabled, you’ll see an error on this page, so make sure it is enabled.)

6-    Above the existing image renditions, click the Add new item link.

7-    Back to image library and edit renditions for s4.jpg

8-    In ImageRenditionsPage.aspx edit page and pick renditions for the image to choose "New Image Rendition".

9-    The result is:

Note: when you open this image in new tab you must find RenditionID in query string .This Id represent the Rendition which you choose.

Image rendi­tions should save SharePoint administrators (and end-users) some headaches by displaying physically smaller, resized, and/or cropped versions of images on pages in the site.

Reference: SHAREPOINT®2013 BRANDING and USER INTERFACE DESIGN Book.