Refine Edges Crisp, Clean, Correct

Images that have noisy, low contrast, or blurry boundaries can end up with jagged results. Use the scalpel and the Edges: menu to deal with this:

  1. Use the scalpel to specify the boundary in sections with high noise or low contrast.

  2. Experiment with different levels of smoothing until the jaggedness is under control.

  3. Recover any lost corners by adding green / red corner marks.

  4. If the background bleeds into the foreground beyond what the Halo Scrubber can handle, you can increase the feathering or offset the boundary to crop the halo out.

Edge Refinement Features

Edge GuardAutomatic Edge Detail Recovery

Clipping Magic features automatic detail recovery along the edges. This makes your clipping boundary look more natural and produces much better results than just applying an alpha-mask.

Edge Guard is only used when the offset is 0 (the default).


Halo ScrubberAutomatic Halo Removal

In most images the background colors bleed into the foreground a little bit. When removing the background from an image this can cause the clipping boundary to look weird, especially when the image is put onto a new background. Clipping Magic automatically detects and removes these halos to produce a clean result that doesn't suffer the shape distortions that just offsetting the clipping boundary causes.


Corner GuardAutomatic Corner Detection For Crisper Results

Clipping Magic features automatic corner detection to keep your result nice and crisp even when there's a lot of smoothing applied. It's on by default, but you can turn it off if you prefer.

Original + Marks

Corners:
original tutorial image w/ marks

Result

result tutorial image

Original + Marks

Corners:
original tutorial image w/ marks

Result

result tutorial image

SmoothingHandle Jagged Clipping Paths

You normally want to use the lowest smoothness setting that gets rid of the jaggedness sufficiently. This is to preserve the feel of the outline and to avoid rounding out undetected corners unnecessarily.

Smart Smoothing uses a smoothing level that adapts to the local character of the foreground, so sharp edges are followed more closely, and fuzzy edges are smoothed out more.

Fixed Smoothing uses the user-specified smoothing level along the entire boundary.

Smart Smoothing and a setting of 1 usually achieves a nice foreground boundary. However, the best setting will depend on your particular image.

You may need to turn off Corner Detection to allow the smoothing to take full effect as the corners may otherwise make the result faceted.

Original + Marks

Smoothing Level: 1
original tutorial image w/ marks

Result

result tutorial image

Original + Marks

Smoothing Level: 0
original tutorial image w/ marks

Result

result tutorial image

Original + Marks

Smoothing Level: 2
original tutorial image w/ marks

Result

result tutorial image

Original + Marks

Smoothing Level: 5
original tutorial image w/ marks

Result

result tutorial image

Corner MarksRecover Overly Smoothed Corners

Some corners will inevitably go undetected by the algorithm, or you may have turned off Corner Detection. And sometimes the image requires a smoothing setting that is so high that the missed corners get rounded out. You can reclaim these corners by adding key green / red marks to force the clipping path to respect the corner:

×

Original + Marks

Corners:
original tutorial image w/ marks

×

Result

result tutorial image

Original + Marks

Corners:
original tutorial image w/ marks

Result

result tutorial image

Feathering RadiusSofter Boundaries, Less Halos

The feathering radius controls how many pixels it takes to transition from fully opaque foreground to fully transparent background. A small radius creates a sharp edge that is suitable for hard objects; a large radius gives an appearance of softness that works well for certain textiles and other soft or fuzzy objects.

While the algorithm normally produces clean foregrounds that are not polluted by so called 'halos' (background bleeding into the foreground), increasing the feathering radius can help in severe cases.

Smart Feathering uses a feathering radius that adapts to the local character of the foreground, so sharp edges stay sharp and fuzzy edges stay fuzzy. Works great on shots with varying levels of focus blur along the foreground edges!

Fixed Feathering uses the user-specified feathering radius along the entire boundary.

Smart Feathering and a setting of 1px usually achieves a very faithful reconstruction of the foreground boundary, and is the recommended setting.

Here is a sample case as illustration:

Original + Marks

Feathering Radius: 1
original tutorial image w/ marks

Result

result tutorial image

Original + Marks

Feathering Radius: 3
original tutorial image w/ marks

Result

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Original + Marks

Feathering Radius: 6
original tutorial image w/ marks

Result

result tutorial image

OffsetCrop Out Severe Halos

The algorithm normally produces clean foregrounds that are not polluted by so called 'halos' where the background bleeds into the foreground. However, in severe cases, or when a very tight feathering radius is desired, you can crop out any halos by offsetting the boundary inwards.

The best setting will depend on your particular image and intended use - here is a sample case as illustration:

×

Original + Marks

Feathering Radius: 0.0px
original tutorial image w/ marks

×

Result

result tutorial image

Original + Marks

Feathering Radius: 2.0px
original tutorial image w/ marks

Result

result tutorial image

Pre-Crop


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