Problem summary:
The Bokeh node's Chromic Aberration knobs do not produce consistent linear changes
This appears to affect the Chromic Aberration (kChrAbb) and Chromic Aberration Offset (kChrAbbOff) knobs
Customer reported version:
Nuke 15.1v3
Customer reported platform:
Windows 10
Steps to reproduce:
1) Download the attached bokeh_knob_test.nk file, then open it in Nuke.
2) View the ContactSheet1 node, and observe how some values of Chromic Aberration have produced identical results:
3) Open the Properties for Bokeh1, and increase the Multiplier knob from 50 to 75.
4) Open the Properties for NoOp1, and press the Check Bokeh Outputs button
5) Observe the results:
Expected behavior:
Every unique value set on the Bokeh node's Chromic Aberration knobs should produce a unique result and follow a linear relationship between input and output, like how other knobs such as Spherical Aberration behave:
Actual behavior:
When the values of a Bokeh node's Chromic Aberration (kChrAbb) or Chromic Aberration Offset (kChrAbbOff) knobs are adjusted, they may not produce any visual difference in the output image. This means that some values don't seem to do anything, while other changes in value can result in a disproportionately large visual difference.
This primarily seems to be influenced by the value of the Bokeh node's Multiplier knobs, and this behavior can also occur when Real World Lens Simulation is enabled.
Workaround:
No known workaround at this time.
Reproduced by Support in:
Nuke 16.0v1 - Windows 11, macOS 14 Sonoma
Nuke 15.1v1 - Windows 11
Nuke 14.0v2 - Windows 11, macOS 14 Sonoma
Earliest version tested:
Nuke 14.0v2 - This feature (the Bokeh node) did not exist before this version
