The best performance for TIFF Navigators is when using EXTERNAL TIFF files.

 

The reason for this is simple.

 

In this mode of storage, the first page of the file is accessed instantly on a load and subsequent pages are just a direct access to the page requested.

 

 

When using Blob field storage (or Blob Automation) then the file has to be loaded into memory by the ImageEx control from the Blob BEFORE even the first page can be displayed.

 

This means that the TIFF Navigators may have unsuitable performance in high traffic areas (such as on a BROWSE) when you are using Blob storage.

 

This is especially true when the Blob files are large or the pages are large (resulting in large file sizes).

 

 

If you are storing small images in the Blob, then the performance may not be an issue for you.

 

 

 

If you are using large Blobs and want TIFF Navigation, you may need to consider keeping a second Blob file that only has small thumbnail images to represent the pages - and setting the Navigators to work on that file.

 

Note: this dual Blob file option is not currently available in ProScan, but we may add it in the future.