Choose Whether to Save an Image of Each View with the Report
Please visit the most up-to-date Power View documentation on office.microsoft.com. Power View is now a feature of Microsoft Excel 2013, and is part of the Microsoft SQL Server 2012 Reporting Services add-in for Microsoft SharePoint Server 2010 and 2013 Enterprise Editions.
Power View saves an image of each view in its current state as a preview for other users (in PowerPivot Gallery and other applications). View preview images are the images that Power View displays in the View pane in design mode. They are snapshots of a view. They are not real-time images, but they do refresh frequently. When you save a Power View report, by default these images are saved with the report. However, the first time you save a file, or when you save as, you have the option not to save them.
They are then displayed:
In the PowerPivot Gallery in SharePoint Server 2010, just as Microsoft Excel worksheets are displayed.
In PowerPoint design mode, as the static images of the views when you export your report.
Consider not saving preview images if they display information that you consider potentially sensitive. Keep in mind that in the PowerPivot Gallery Carousel view displays images that are large enough to be readable. Views without preview images are shown with a watermark icon and a label, 'Preview not available'.
Also, if you open and view the views in a report that has preview images saved with it, when you save the report you are saving the updated preview images. To avoid this, click Save As instead.