16-Bit Display Mapping Is Not Working On IMAQ Image Display

Updated Jan 10, 2018

Reported In

Software

  • LabVIEW Full

Driver

  • NI-IMAQ
  • NI-IMAQdx

Issue Details

Whenever I right-click an IMAQ Image Display in LabVIEW and select 16-Bit Display Mapping..., none of the options in this menu seem to change the appearance of the image. How can I solve this?

Solution

This is expected behavior. 

Additional Information

​NI-IMAQ, NI-IMAQ for 1394, and NI-IMAQdx specify the bit depth for the images they acquire, and when the bit depth for an image is known, the IMAQ Image Display uses this bit depth.  When loading a file from disk, the file format may not specify the bit depth, in which case the display falls back to the settings specified by right-clicking and selecting 16-Bit Display Mapping.

If you want to use the user settings for an image with a known bit depth, use the IMAQ Image Bit Depth VI to set the bit depth for the image back to zero which indicates that the entire range for that image datatype should be used. The mapping settings will then map your pixel values accordingly.

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