Curve Tracer v1.0.0[Aescripts][WIN][MAC]

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Download Curve Tracer v1.0.0[Aescripts][WIN][MAC]
Plugins & Scripts | Size: 9.88MB
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How it works
Curve Tracer plugin simulates the process by which an artist creates a drawing by pencil. The drawing is an abstract rendition of another, full color image or animation. The artist would first make a few “sketching” curves, which serve as a rough estimation of the shape of the final drawing. Then they would continue with the main – more detailed – curves that may also be shaded so as to convey a sense of depth.

The filter works by analyzing the edges / contours of the incoming image and converting them to a collection of splines (curves). These curves are then smooth or decimated in vector space, and finally rendered as continuous segments. A post-processing step adds colors and a light “bloom” effect, to aid realism.

Available parameters rundown
Preset – Start from scratch or apply one of twelve presets for various styles.
Canny edge Detection
The image needs to be converted to a map of edges, as a binary image. For this, we use Canny edge detector, a technique that is widely adapted and used in computer vision systems.

Image Smoothing – Application of Gaussian smoothing before Canny edge detection – to smoothen out edge transitions.This will eliminate high frequency noise so that splines are more organic.
Low Limit – First limit for the hysteresis procedure (during Canny).
High Limit – Second limit for the hysteresis procedure. The two limits decide on which edges are kept and which are discarded. The pixel gradient values that lie above the low values are kept, and those below are discarded. Those in-between have special rules based on connectivity. These values are best explored via trial and error. A value between 2:1 to 3:1 ratio between the Limit values is recommended.
Sampling precision – Percentage of pixels sampled from Canny map. A low value signifies stepping over over values, thus producing a more sparse map. This gives an appearance of curves made out of horizontal/diagonal straight lines.
Curve style
After Canny detection, the edges transform into vectorized curves. These options affect all such curves.

Width – Width of curves in pixel units.
Additional Smooth – A different algorithm that gives similar results to Smoothing, albeit with a larger smooth aperture.
Detail – Percentage of curve points sampled and recreated again as a continuous curve. This is the equivalent of Sampling precision from Canny edge Detection, but in vector space.
Line Style – A choice between Solid or Dashed curves. Dashed will appear as a series of short strokes.
Line Ending Length – This is an option for scaling down the width of either end of each curve; so that the curves may look like finishing into a point. It represents the distance from end (or beginning) before the effect starts taking place.
Line Ending Width – Percentage for the effect of line ending scaling. A combination of this and the previous value (0 and 100%) will generate the effect of pointing finish.
Main Contour
All curves are separated by function to Main/Lighting and Sketch contours. Each has a different function. The Main contours can be seen as the baseline. Lighting are additional contours, rendered with different color (usually bright, to indicate lighting effect – with light coming from a user-defined direction on the XY plane of the image).

Main Color – Color of main contour.
Main Opacity – Alpha opacity of main contour.
Source Color Mix – Percentage of mixing of Color and colors derived from projecting over the source image.
Lighting Coverage – Normalized (0-100) value of coverage of lighting contours. The higher the value, the more lighting contours will appear.
Lighting Scale – Percentage of the scale of the Curve Style Width to be used for rendering lighting lines. Use a high value to accentuate lighting contours.
Lighting Angle – Indicates position of virtual light source on the image plane. The calculations for the lighting are based on the lighting angle and orientation of the curve at given points.
Lighting Color – Color of lighting contour.
Lighting Opacity – Alpha opacity of lighting contour.
Sketch Contour
Sketch contours have the function of simulating “hand written” contours, usually with a color that is typically darker.

Sketching Steps – Amount of Sketching-style overlays; each will have a slightly different smooth parameter in order to simulate an effect of “preliminary” sketches, with less defined detail.
Sketching Smoothingy – Smoothing of first sketching contour. Each additional one (their number is given by the Sketching steps parameter) will have a slightly increased smoothing factor. This can be seen as the baseline parameter.
Sketching Color – Color of Sketching contour.
Sketching Opacity – Alpha opacity of Sketching contour.
Source Color Mix – Percentage of mixing of Color and colors derived from projecting over the source image.
Rendering
Rendering options for post processing.

Skip Frame(s) – Adjust original footage’s FPS and allow less frames per second for filtering in order to suppress jitter and relate closer to the feeling of traditional cel animation.
Halo Main – A Gaussian blurred image of the curves, added over the rendering – giving it a soft halo appearance.
Halo Highlight – Additional soft halo rendering of the “highlight” curves.
Halo Size – Size of the Gaussian filter that produces the halo, in pixels.
Composite On Original – Enable or disable overlaying the original image (before curve conversion and rendering), over the final render.
Blending – Option for Additive or Normal (alpha based) blending of the overlay.

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