User Manual

Common Controls
Settings Tab
The Settings tab controls are common to all Filter nodes, so their descriptions can be found in
“The Common Controls” section at the end of this chapter.
Custom Filter Node [CFlt]
The CustomFilter node
Custom Filter Node Introduction
The Custom Filter node is used to apply custom convolution filters to images. A custom
convolution filter can give a wide variety of image effects. For example, emboss, relief, sharpen,
blurring, and edge detection are all convolution filters. There are many supplied custom filters
in the Filters directory that can be loaded by right-clicking on the control header and selecting
Settings > Load from the contextual menu.
The Custom filter uses an array (or grid) of either 3 x 3, 5 x 5, or 7 x 7 values. (Note: The array in
the Inspector always shows a 7 x 7 grid; however, setting the Matrix Size to 3 x 3 uses only the
center 9 cells.) The center of the array represents the current pixel, and entries nearby
represent adjacent pixels. A value of 1 applies the full value of the pixel to the filter. A value of 0
ignores the pixel’s value. A value greater than 1 multiplies the pixel’s effect on the result.
Negative values can also be entered, where the value of the pixel is subtracted from the
average. Only integer values can be entered; 0.x is not valid.
Input
The Custom Filter node includes two inputs: one for the main image and the other for an effect
mask to limit the area where the custom filter is applied.
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Input: The orange input takes the RGBA channels from an image to calculate the
custom filter.
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Effect Mask: The optional blue effect mask input accepts a mask shape created
by polylines, basic primitive shapes, paint strokes, or bitmaps from other tools.
Connecting a mask to this input limits the custom filter to only those pixels within the
mask. An effects mask is applied to the tool after the tool is processed.
Basic Node Setup
The Custom Filter node can be inserted after an image, mask, or any node that needs a custom
convolution filter applied.
A Custom Filter node placed after a MediaIn node in DaVinci Resolve
Chapter – 91 Filter Nodes 2036