WIth respect to .TIF image files, how can 1 bank use 2 type "II*" records for each check while other banks use only 1 type "II*" record per check?

I wrote a C# console application that reads Bank A's input file that contains the front and back check images of a group of checks and also contains metadata.
I read this bank file and output a .tif file that contains just the front and back check images for each check in the bank file.
The input file contains a field that contains the size of the Front Check Image and another field that contains the size of the Back Check Image.
I know where to find the first Front Check Image because the file consists of records that are all of the same length and the records are distinguished by record type.
The Front and Back Check Image records start with the value "II*".
I write out all the check image records that start with "II*' to an output file.

What I don't understand is that another bank, Bank B, sends us a file of check images that consists purely of bank check image records (no metadata) and yet there is only 1 record per check that starts with a leading value of "II*" and this 1 record per check contains BOTH the Front Check Image and the Back Check Image.

Can you explain why Bank A uses has 1 record with "II*" as the lead characters at the beginning of the Front Check Image, and 1 record with with "II*" as the lead characters at the beginning of the Back Check Image for each check. Thus for each check there are 2 records beginning with "II*".
Bank B which has 1 record per check with "II*" as the lead characters at the beginning of the Front Check Image and Back Check Image. Thus, for each check there is 1 record beginning with "II"".
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Darrell PorterEnterprise Business Process ArchitectCommented:
Usually the TIFF format of check images from banks is dependent upon their imaging application and their document management system.  EPM and Onbase, for example, creates TIFFs with a II* record per document side by default (this setting is configurable in both) while Konica's document imaging solution creates a single II* record per page.

I think it may help you to inquire as to which imaging solution your client banks use and make it a configurable option within your application.

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