How to Update the web.config file to get the Image Rendition to work on SharePoint 2013

1.     Open the 2012 Server(s)

2.     Open C:\inetpub\wwwroot\wss\VirtualDirectories\[site]

3.     Make a backup copy of the web.config

4.     Open Search

5.     Hover over the bottom right of the screen.

6.     Click Search

7.     In the search box, search for Notepad

8.     On the left, right click on Notepad

9.     At the bottom of the screen, click on Run as administrator

10.     Click Yes

11.     Click File

12. Select Open 

13. Goto C:\inetpub\wwwroot\wss\VirtualDirectories\[site]

14. Select web.config

15. Click Open

16. Change the BlobCache settings

<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="true" />

17.     Click File

18.     Select Save

19.     Close Notepad

Done :)