The Extraction Group provides a set of basic luminance keying tools to manage the apparition or constrain the Mosaic effect to a particular luminance range of the input footage. Additionally this group supplies compositing options to blend the result in several ways.

Key - This menu switches between the two modes of extraction, Hard or Soft.

Hard - Drives the apparition of the Mosaic according to a simple luminance threshold. Cells are turned on and off without intermediate values. Lighter pixels have more impact on the effect.
The Invert switch reverse the priority to darker pixels.

Soft - The Mosaic is applied to a given range of pixels, based on their luminance values. Luminance values range from 0 (black) to 1 (white). The Luminance, Aperture and Softness parameters give precise controls to define this range :

Luminance - Specifies the center of the range of pixels. For example, a value of 0.5 means that the effect is applied to pixels that are 50% bright.

Aperture - Controls the width of this range.
For example, a value of 0.5 with aperture of 0.2 means that all pixels between 40% and 60% brightness will be used as the source for the effect. An aperture value of 1.0 means that the effect is applied to the entire image.

It may be desirable to have a smooth transition between the pixels that are within the range and those that fall outside it. This can be done using the the Softness parameters.

Softness - Defines the width of this smooth border. By adding soft borders to the range (one at the start, one at the end) you eliminate the sharp transition. A softness of 1.0 means that the range is smoothed over the entire image.

Composite On - This menu gives several options to composite the final effect and set the background appearing across the textured cells (when setting the Extraction Threshold < to 100% ), through the transparent parts or mixed with the mosaic using the blending modes.
Note: This menu is hidden in After Effects, when the “Use AE Camera”option is activated and a camera exists in the composition. In this case, the effect is automatically composited on a transparent background.
- Color - Composites the effect on a coloured background with an adjustable opacity.
Original Footage - Composites the effect on the original input image.
Transparent - Composites on a transparent Background.
Blending Mode - This Menu appears when you set the background to “Original Image” and lets you apply differents blending modes. Notice you can invert the motif color with the Invert Color switch located in the Material Group to transpose the result of these blending modes.
- Normal - No blending mode is applied.
Screen - Reveals the original footage through the black parts of the motif.
Multiply - Reveals the original footage through the white parts of the motif.
The Tiling Group controls the slicing and the adaptive aspect of the Mosaic. Two types of tiling are possible.
When the
Adaptiveness parameter is set to 0%, a classic tiling where all the cells have an equal dimension is achieved. With an Adaptiveness value superior to 0%, the algorithm starts to produce adaptive tiling with cells of multiple dimensions with an homothetic ratio.
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How does Mosaic adaptive tiling work ?

To decide the distribution and the cell sizes, Mosaic analyses the direct neighbors of a given pixel. If the neighbors have a near similar color, a large cell covering the region is generated. Alternatively, parts in the footage where pixel colors are different generate areas of smaller cells with their sizes adapting to the details of the footage.

Uniform - When activated, this option forces the tilling to resolve using only entire cells. It means the cells will not be cropped on the borders of the image or canvas.
Notice there are rare cases where the original image ratio and the motif cell ratio is incompatible and produce mapping deformation. Deactivating the Uniform option will fix this distortion freeing the borders of the image to crop the cells.

Recursivity - Sets the depth of the effect adjusting the grid resolution. Larger values generate more cells and more details.

Adaptiveness - Defines the range of cell sizes and gives priority to larger or smaller cells. For example, a value of 0% means more smaller cells of identical sizes. An adaptiveness value of 100% means more larger cells of identical sizes. All values between the extremes generate a range of different cell sizes.