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In: Filters > Adjustments
Description
Reduces the amount of colors in a color image, effectively flattening gradients.
In addition to the processed image, the node also extracts the following:
- A palette of the remaining colors, which may be used to colorize other images
- An ID map of the quantized areas, which may be used to recolorize the processed image using a different palette
- The amount of remaining colors as a raw integer value
If the 'Ignore alpha' parameter is set to 'False', the alpha channel of the original image is used to select the areas of the image from which the colors should be extracted for the quantization process, while colors in transparent areas are ignored.
This effectively provides some control over the extracted colors.
This node may be used in combination with the following nodes: Create Color Palette, Apply Color Palette, Modify Color Palette, View Color Palette.
Input Color PRIMARY |
The color image which should be quantized. |
Output Color |
The quantized color image. |
ID Grayscale |
A map where each quantized color is assigned a unique integer identifier.
This may be used to:
|
Palette Color |
The palette extracted from the image, holding the remaining colors after quantization.
The image is an ordered list of RGB colors encoded as a row of pixels, and can hold a maximum of 256 colors.
The palette may be visualized with the View Color Palette node. |
Palette color amount Integer |
The amount of colors stored in the palette. |
Max. color amount Integer |
The maximum amount of colors which should be used in the quantized image.
This amount is the same used in the Palette extracted from the image.
'Maximum' means this amount may not be met, because of the quantization technique being used. Check the 'Palette Color Amount' output for the actual amount of extracted colors. |
Contour smoothing Float |
Controls the radius of a smoothing effect applied to the input image, used to simplify the quantized image into more solid, cohesive shapes.
Note: This smoothing requires intensive computations thus raising this value noticeably increases the node's computation time. |
Dithering Float |
Applies a dithering pattern in order to recreate the gradients and color blends in the original image, while still only using the colors remaining after the quantization.
Make sure to use a 'Contour Smoothing' value of 0 to produce the expected dithering effect. |
Dithering pattern Integer |
The dithering pattern used to recreate the gradients and color blends in the original image:
|
Ignore alpha Boolean |
By default, the alpha channel of the original image is used to select the areas of the image from which the colors should be extracted for the quantization process, while colors in transparent areas are ignored. This effectively provides some control over the extracted colors.
Indeed, you may wish to only use the colors in the visible parts of the image for the quantization process.
This toggle lets you disable this masking and use the full image regardless of transparency. |
Distance color space Integer |
Colors are arranged in a cube which width, height and depth are a gradient where each component of a color increases from 0 to 1 (E.g. red, green and blue in RGB).
The quantization process involves selecting the defining colors in an image, then finding the colors closest to them in the cube and replacing them with that defining color.
This parameter lets you select the color space used to distribute colors in the cube, which changes the result of the quantization by changing the criteria for detecting a defining color and rearranging neighbouring colors.
You may select the color space which fits your use case:
|
ID sort mode Integer |
Colors are arranged in a cube where width, height and depth are a gradient where each component of a color increases from 0 to 1 (E.g. red, green and blue in RGB).
This parameter selects the method used to order the list of colors in the extracted palette, and the indexes in the areas of the extracted ID map:
|