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How to compare a Twirl warp with the original on Mac

Twirl part of a photo in Bump Distortion, save the edit, then compare it side by side with the untouched original.

9 stepsUpdated Nov 12, 2026Get Bump Distortion
What you'll achieve
You will have a Twirl-warped variation and a side-by-side comparison with Original on the left and Variation 1 on the right.
What you need
  • Bump Distortion 3.0 on a Mac.
  • A photo to edit. The example uses the bundled sample fixture hero-portrait.jpg.
Bump Distortion on Mac comparing the untouched original photo at left with a Twirl-warped variation at right

A local warp can reshape one area without replacing the source photo. This walkthrough shows how to apply a Twirl distortion, keep an editable alternative, and inspect the warped image alongside its original in Bump Distortion for Mac. The example uses a sample photo; your own photo and edit can look different.

  1. 1.Open the warp workspace

    Launch Bump Distortion. Its opening workspace offers sample photos and an Open Image... button for your own picture.

    Bump Distortion opening workspace with sample images and Open Image button
    Bump Distortion opening workspace with sample images and Open Image button
  2. 2.Load the source photo

    Use Open Image... to select a photo. The editor opens with the image on the canvas and a first Bump warp in the inspector.

    Photo open in Bump Distortion with initial Bump warp and Radius controls
    Photo open in Bump Distortion with initial Bump warp and Radius controls
  3. 3.Choose Twirl distortion

    In Selected Warp, change Distortion Type from Bump to Twirl. The photo updates and the circular distortion controls remain editable.

    Photo in editor with Twirl selected in Distortion Type and circular handles
    Photo in editor with Twirl selected in Distortion Type and circular handles
  4. 4.Position the Twirl center

    Drag the on-photo Distortion Center handle toward the area you want to reshape. The example positions the center near the upper part of the image.

    Twirl center moved toward top of photo with circle over the canvas
    Twirl center moved toward top of photo with circle over the canvas
  5. 5.Expand the affected area

    Drag the Distortion Radius handle outward until Radius is around 580 px. The Twirl now affects a wider area; reduce the radius if you want a subtler change.

    Twirl radius expanded to 580 pixels with visible broad swirl distortion
    Twirl radius expanded to 580 pixels with visible broad swirl distortion
  6. 6.Keep the warped version

    Click Keep Variation at the bottom of the editor. A new editable variation appears in the strip without replacing the original photo.

    New editable Variation 2 saved in bottom variation strip beneath warped photo
    New editable Variation 2 saved in bottom variation strip beneath warped photo
  7. 7.Name the saved variation

    Use the new variation's name field to give it a recognizable label. In this sample study, the new variation is called Alex Smile.

    New variation renamed Alex Smile in the variation strip
    New variation renamed Alex Smile in the variation strip
  8. 8.Open the comparison view

    Click Compare in the toolbar. The comparison view opens with two editable versions Side by Side.

    Side by Side comparison opens with two warped variants selected
    Side by Side comparison opens with two warped variants selected
  9. 9.Compare against Original

    Under Left, choose Original; leave Variation 1 under Right. The left pane now shows the untouched photo and the right pane shows its Twirl-warped alternative.

    Side by Side comparison shows Original at left and Twirl-warped Variation 1 at right
    Side by Side comparison shows Original at left and Twirl-warped Variation 1 at right

After the last step

Both remain available for inspection without discarding the source image.

Tips

  • Use the on-canvas center and radius handles together to control where and how broadly Twirl acts.

  • Keep an alternative before comparing so you can inspect more than one editable look.

  • The final side-by-side comparison uses Original at left and Variation 1 at right; another saved variation remains available in the bottom strip.

  • Watch outThe sample photo and exact visual distortion differ from the store's original editorial shot; your own image will produce different pixel results.

  • Watch outA large Twirl radius can bend a subject dramatically. Reduce Radius for a narrower effect.