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Lyric Edge Work

Edge Work

The Lyric Edge Work filter is a stylizing effect that uses edge-extraction techniques to produce a range of artistic special-effects. The edge-extraction is performed with one of two methods, Soebel Convolution, which produces smooth, fixed width edges or Gaussian Difference, which produces hard, variable-width edges. The basic operation of the filter is to extract & perform various manipulations on the edges and then overlay them back on a selected backgound, such as a set color or the chroma from the original source. The original edge colors can be retained, or converted into a selectable "ink" color.

The Lyric Edge Work filter includes a set of effect controls that are common across all Lyric effect filters. For a detailed description of these controls, please see the Common Effect Controls documentation.

Additionally, all Lyric Effect filters can be applied through mattes or masks to constrain the filter effect to particular areas of the image. For background information on mattes and masks, please refer to the Lyric Matte Primer.

The Edge Method dropdown menu selects between the two edge-extraction techniques. See the Edge Detection section below for more details.

The Threshold slider controls the sensitivity of both edge methods; lower values reduce sensitivity, thinning out the edges, and higher values increase sensitivity such that more subtle differences in color are considered edges.

The Gaussian Edge Width slider is only active when the Gaussian Difference method is selected and it changes the radius of the gaussian blur. Higher values increase edge inclusion, lower values thin the edges. Lower gaussian values with higher threshold settings produce more defined edges.

The Choke/Expand slider can be used to shrink or grow the egdes. Dragging it to the left shrinks the edges in; dragging to the right adds to the edges. Edge Harden controls the rolloff at the matte edges; drag it to the right to harden the edges. This is effectively a variable rolloff threshold.

The Diffuse control can be used to diffuse the edges by randomly offseting the pixels within them. Small values can add a more sketched styling, while larger values give the impression of linework bleeding into wet color washes.

The Feather slider can be used to add a feathering blur to the edges, and Edge Contrast can be used to raise or lower the contrast of the edges.

The Edge Effects section contains controls that set the overall effect method. The Effect Mode dropdown menu selects between several ink and paint schemes:

edgeworkmodemenu

The four Inked Edges modes transform the edges into the color specified in the Ink Color control and apply it as an ink effect. The four Source Edges modes retain the colors from the source video. In both cases, there are four "edge application" modes, applying the edge ink or color over a selected background.

Edges over Source uses the original source video image as the background, so for example Inked Edges over Source would apply the ink color to the edges of the original source video. Note that Source Edges over Source has no apparent effect unless Edge Contrast is applied or the Cross Fade control is used, as described below.

Edges over Background uses the Background Color as the background, so for example, Source Edges over Background overlays the original source image edges over a background color matte.

Edges Only sets the video's alpha-channel to just cover the inked areas, so that you can composite the edges over another video track.

Edges over Chroma uses the chroma-channels from the source video as background, yielding a cartoon-style result.

Cross Fade allows fine tuning over the ink & background mix; sliding it to the left decreases the opacity of the ink, letting more of the background show through. Sliding it to the right decreases the opacity of the background, making the ink more prominent. In the latter case, the background fades into the Background Color in the case of Edges over Source or Chroma modes and fades into the Ink Color in the case of Edges over Background modes.

The Show Ink Area checkbox can be used to quickly check the edge areas that will be inked, showing them in black over white while this control is checked.

The Effect Controls section is a set of common controls that are documented on the Common Effect Controls page. They can be used to achieve masked and other specialized filter effects.

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edgeworkpan
edgework3

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original

Diffuse
Edge Contrast
Effect Mode
Cross Fade
 

= 30
= 79
= Source Edges over Chroma
= 45

edgework2

original

Edge Method
Threshold
Gaussian Width
Edge Contrast
Effect Mode

 

= Gaussian Difference
= 59
= 20
= 100
= Ink Edges over Chroma

 

Edge Contrast


 

= 74

 

Edge Method
Threshold
Gaussian Width
Contract/Expand
Effect Mode

= Gaussian Difference
= 0
= 15
= 13
= Source Edges over Chroma

Edge Method
Threshold
Gaussian Width
Edge Contrast
Effect Mode

= Gaussian Difference
= 0
= 15
= 40
= Source Edges over Background

Threshold
Effect Mode

 

= 62
= Source Edges over Background

 

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soebelgausscompare2

Edge-detection Methods

The Edge Work filter has two alternative edge-detections methods, Soebel Convolution and Gaussian Difference, selectable in the Edge Method dropdown menu.

Soebel Convolution uses a set of 4 special convolution kernels to produce a smooth, though somewhat broad edge. Since the convolver radius in Final Cut is fixed, there is no direct way to control edge width in the convolution, but both the Threshold control and the Choke/Expand control can give substantial control over edge definition.

Gaussian Differencing uses the same technique that the well-known Unsharp-mask sharpening filter uses. It takes a blurred version of an image and subtracts it from the original. Since broad, unchanging areas in the image remain similar under blurring, but edges soften and lose their definition, this subtraction results in all the broad areas disappearing, leaving the edges. It results in a harder, more sketched style of edge compared to Soebel Convolution and with higher blurring radii can include broader areas where there is nearby high-contrast within the radius.

The following examples show the same image with the alternative methods at the default settings.

Soebel Convolution
Threshold = 0

Gaussian Difference
Threshold = 0
Gaussian Edge Width = 15

Final Cut Plugins

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