Details
Saving a ray traced static image from the Ray Traced Studio doesn't save the specified resolution metadata (DPI) along with the image file.
Checking the image properties later in other applications like Windows Explorer or any graphics editor will show the resolution with a default value of 72 or 96 DPI which is the vendor choice.
Solution
The DPI (dots per inch) or PPI (pixel per inch) information is no indicator for the quality of the image.
It is used in the Ray Traced Studio Editor in conjunction with the image size to calculate the resulting pixel width and height:
physical units in inch * pixel per inch = number of pixel in x and y
For example, an image with 3000x2000 pixel with 72 DPI will extend to a width of 41.67 inch and with 300 DPI to 10 inch only.
So this value is meaningful for a printed photo proof, for example "printed with 300 DPI" correlates with the visual grain.
Theoretically it may also be used by third party software or devices to evaluate a target print media size automatically by dividing the pixel width and height by the DPI value.
If the embedded DPI metadata is required then the image can be opened in a photo editor software to adjust the DPI settings as necessary and saved it with the DPI information included.
Notes and References
See Enhancement Request ER-8416040 asking for a Ray Traced Studio Editor option to save the resolution metadata into the image on demand.
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: SYSENG
Version: V1859
Function: VISUALIZATION
Ref: 002-8013900