In Q2 2015 we will introduce two properties in the ExportToHTML: 
 - The ExportImages property indicates whether to export image or not.
 - The ScaleImages property indicates whether to scale exported images.

Here is the code snippet: 
ExportToHTML exporter = new ExportToHTML(this.radGridView1);
exporter.ScaleImages = true;
exporter.ExportImages = true;
exporter.RunExport(fileName);