Why are images not being displayed in the html browser application?

Some image formats are not supported by all browsers.

For reference to image formats and the browsers that support them:
https://en.wikipedia.org/wiki/Comparison_of_web_browsers#cite_note-TIFF-220

To display all images you can:

1. Set driver options to return specific image formats.
   
2. Not all scanners support different image formats.
   
3. For all driver options available for a scanner using Ranger version 4 and up, see the driver options INI file located at:
   
1.       C:\ProgramData\Silver Bullet Technology\Ranger\Scanner Plug-ins\[Scanner Name]
   
4. For all driver options available for a scanner using Ranger version 2, see the INI file located at:
   
1.       C:\ProgramData\Silver Bullet Technology\Ranger\[Scanner Name]
   

      2. Convert all images returned to the app from Ranger to a supported image type.

Note: If you're using a SmartSource scanner and your grayscale JPEG formatted images
are still not displaying, it is likely that you are configured to receive TIFF wrapped JPEG (the default).

Also see: Why are my grayscale images JPEG wrapped in a TIFF header?

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Ranger^® - The universal check scanner interface

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