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QA

QA nodes measure a result instead of changing it. Add them at the end of a retouch chain to see how much an edit moved the image, to confirm that a change stayed inside the area you masked, or to compare two settings on the same input.

  • QA Image Diff

    Compares two images with SSIM, PSNR and MAE and draws a heatmap, absolute or SSIM-map difference.

  • Cull Score

    Ranks a batch by sharpness, exposure, closed eyes and duplicates; keeps the best.

For checking a mask rather than an image, use Mask Preview from the Masks group.

Typical chains

  • Did my retouch only change the skin? original and retouched image → QA Image Diff (add the skin mask to limit the numbers to that area) → read the changed_pct and the heatmap.
  • Compare two settings: run the same photo through two versions of a node → feed both results to QA Image Diff in ssim_map mode to see where the structure differs.
  • Check a smoothing pass: Skin Smoother → QA Image Diff against the original, then use Mask Preview on your skin mask to confirm they line up.