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.
- 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.

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.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 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 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 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 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 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 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 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 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
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.