To display color output in Office 2007 - 2010 documents, set the xlsxBitDepth and docxBitDepth parameters to 24 and the xlsxDPI and docxDPI parameters to 200 as shown in the following example:

<init-param>
  <param-name>xlsxDPI</param-name>
  <param-value>200</param-value>
</init-param>
<init-param>
  <param-name>docxBitDepth</param-name>
  <param-value>24</param-value>
</init-param>
<init-param>
  <param-name>docxDPI</param-name>
  <param-value>200</param-value>
</init-param>
<init-param>
  <param-name>xlsxBitDepth</param-name>
  <param-value>24</param-value>
</init-param>
<init-param>
  <param-name>xlsxDPI</param-name>
  <param-value>200</param-value>
</init-param>
<init-param>
  <param-name>docxBitDepth</param-name>
  <param-value>24</param-value>
</init-param>
<init-param>
  <param-name>docxDPI</param-name>
  <param-value>200</param-value>
</init-param>

Note: If you experience errors processing Office 2007-2010 documents, please ensure that Aspose.Words..jar, Aspose.Cells.jar and dom4j-1.6.1.jar are on the CLASSPATH. This issue should not typically appear however in VirtualViewer versions 5.0 and later.