Changing the size of images ignored by Image Analyzer evaluation

This article applies to:

• Trustwave SEG 7.2 and above
• Image Analyzer functionality

Question:

• How can I adjust the setting for small images ignored by Image Analyzer?

Information:

SEG 7.2 and above limits which images are submitted to Image Analyzer. By default, images smaller than 75x75 pixels are not submitted.

This limitation helps to speed processing and avoid false positive returns from common small images such as corporate logos.

You can configure the size of ignored images using Registry settings.

• Note: If EITHER of the conditions is met then the image will not be submitted. For instance by default an image 70x76 pixels would not be submitted.

1. On the Array Manager, edit the Registry (10.X: use Advanced Settings in the Management Console)
2. Navigate to the SEG Engine key:
   • In version 8.X: HKEY_LOCAL_MACHINE\SOFTWARE\Trustwave\Secure Email Gateway\Default\Engine
   • 10.X: value names have the prefix Engine. (Engine dot).
   • For full details of the location for each product version, see article Q10832.
3. Edit either or both of the following DWORD values:
   • ImageAnalyzerMinWidth: Minimum width in pixels of images to submit to Image Analyzer. Images with a smaller width will not be submitted. Default: 75 (decimal). 
   • ImageAnalyzerMinHeight: Minimum height in pixels of images to submit to Image Analyzer. Images with a smaller height will not be submitted. Default: 75 (decimal). 
4. To apply the change, commit configuration and then restart the Engine service on all nodes.

As always, take due care when editing the Registry. Trustwave recommends that you make a backup before applying any changes.