„LIC“ stands for Line Integral Convolution, a mathematical method. This filter is used to apply a directional blur to an image, or to create textures. It could be called „Astigmatism“ as it blurs certain directions in the image.
It uses a blur map. Unlike other maps, this filter doesn't use gray levels of this blur map. Filter takes in account only gradient direction(s). Image pixels corresponding to solid areas of the map are ignored.
Подсказка | |
---|---|
|
By selecting Hue, Saturation or Brightness (=Value), filter will use this channel to treat image.
The „Derivative“ option reverses „Gradient “ direction:
You can use two types of convolution. That's the first parameter you have to set:
White noise is an acoustics name. It's a noise where all frequencies have the same amplitude. Here, this option is used to create patterns.
The source image will be blurred.
That's the map for blur or pattern direction. This map must have the same dimensions as the original image. It must be preferably a grayscale image. It must be present on your screen when you call filter so that you can choose it in the drop-list.
When applying blur, this option controls how important blur is. When creating a texture, it controls how rough texture is: low values result in smooth surface; high values in rough surface.
This options controls the amount and size of White Noise. Low values produce finely grained surfaces. High values produce coarse-grained textures.
This options controls the influence of gradient map on texture.
Both values determine a range controlling texture contrast: shrunk range results in high contrast and enlarged range results in low contrast.