From left to right: original image, map, resulting image
“LIC” stands for Line Integral Convolution, a
The plug-in author uses mathematical terms to name his options...
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 grey
levels of this blur map. Filter takes in account only
gradient direction(s). Image pixels corresponding to
solid areas of the map are ignored.
Activate the filter
You can find this filter through
→ → .
“Van Gogh (LIC)” filter options
To create a blur, check With Source Image.
Only Filter Length slider and perhaps Integration Steps slider,
To create a texture, check With White Noise.
All sliders can be useful.
You can use two types of convolution. That's the first parameter
you have to set:
With White Noise: White Noise is an
acoustics name. It's a noise where all frequencies have
the same amplitude. Here, this option is used to create
With Source Image: 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.
Blurring with vertical gradient map
Blurring with a square gradient map
By selecting Hue, Saturation
or Brightness (=Value), filter
will use this channel to treat image.
The “Derivative” option reverses “Gradient
Derivative option example
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.
Action example of Filter Length on blur
Filter Length example on texture
This options controls the amount and size of White Noise. Low
values produce finely grained surfaces. High values produce
Action example of Noise Magnitude on texture
This options controls the influence of gradient map on texture.
Action example of Integration Steps on texture
Both values determine a range controlling texture contrast:
shrunk range results in high contrast and enlarged range results
in low contrast.
Action example of Min/max values on texture