Symptoms
You specify the ImageConsolidation device information setting for HTML renderer in the RSReportServer.config file in your instance of Microsoft SQL Server 2012 Reporting Service (SSRS 2012) or SSRS 2014. However, this setting is not honored when you view the report in a web browser.
Note The same device information setting works as expected when it is passed through a URL access.Resolution
This issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 1 for SQL Server 2014 SP1 /en-us/help/3067839
Cumulative Update 6 for SQL Server 2014 /en-us/help/3031047
Cumulative Update 3 for SQL Server 2012 SP2 /en-us/help/3002049
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.