Skip to main content
Solved

NumericRasterizer Not Respecting Tolerance Parameter

  • March 2, 2026
  • 1 reply
  • 101 views
thespatialist
Participant
Forum|alt.badge.img+1

I believe there’s an issue with the tolerance values greater than 0.5 not being respected when using the NumericRasterizer transformer.

With tolerances like 0 and 0.5, I can see a difference in output. However, a tolerance value of 1.0 has no change in the output.

Output from NumericRasterizer with tolerance set to 0.0, with the input vector overlayed

 
Output from NumericRasterizer with tolerance set to 0.5, with the input vector overlayed

 
Output from NumericRasterizer with tolerance set to 1.0, with the input vector overlayed

 

 

Going by the documentation, it explicitly states that a tolerance of 1.0 will draw all pixels touched by the input vector line, which can been seen above as not being seen in the output.

Work flow and NumericRasterizer parameters

 
Documentation of the tolerance parameter from the corresponding version of FME Flow

 

 

I have test values such as 0.7 0.8, 0.9, and 0.999 with no luck.

 

Does anyone know if this is intentional or a bug? And if so, how might one achieve a perfect rasterization as described when the value is 1.0?

 

This was tested in FME Form/Workbench 2025.2.3. 

Best answer by jamatsafe

Hi ​@thespatialist , this appears to be the same topic as your other thread on NumericRasterizer tolerance. We already have this filed under FMEENGINE-83896.

To keep the discussion in one place, please check the workaround option(s) in the other thread. We’ll share an update once the issue has been resolved!

    1 reply

    jamatsafe
    Safer
    Forum|alt.badge.img+19
    • jamatsafeSafer
    • Safer
    • Best Answer
    • March 16, 2026

    Hi ​@thespatialist , this appears to be the same topic as your other thread on NumericRasterizer tolerance. We already have this filed under FMEENGINE-83896.

    To keep the discussion in one place, please check the workaround option(s) in the other thread. We’ll share an update once the issue has been resolved!

      Community Stats

      32,405
      Posts
      123,160
      Replies
      40,510
      Members
      Terms & ConditionsCookie settingsAccessibility statement
      A product of
      Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.