Color Banding on the Bentley, oh my!

After applying optional Denoise enhancement adjustment, Photo AI 3.0.0. rendered some color banding on the grill of a classic Bentley automobile.

Steps to reproduce issue:

  1. Load supplied image into Topaz Photo AI 3.0.0 (Windows version). Topaz Photo AI automatically renders adjustments for some Sharpening and a person or two. However, the Bentley wing fender looks grainy-noisy. (gasp!)
  2. Click Add Enhancements.
  3. Click Denoise. AI Model is Normal. Change Strength to 11. Don’t change other values.
  4. Click Export Image.
    Result: horizontally arrayed color banding appears on grill. See screenshot.

    Attached is also the source file before making changes to Enhancements (Denoise).

Topaz Photo AI [v1.x.x] on [Windows/Mac]

Thanks for sending in that file, could you tell me what camera model you are using?