MATERIAL COLORS
We would recommend activating the Preview Texture option (Material Group) when customizing the color of the motif, it helps to visualize changes more easily.

The Material Colors Group lets you customize the colors of the default and custom motifs. When the
Color Mode is set to Raw, the original colors of the motifs or your own texture are untouched. When the Color Mode is set to Custom, new parameters appear and provide an interface to control the Front and Back Colors of the motifs. Ideally you should create your custom motifs in white on a transparent background.
Front Colors are applied to the opaque white pixels.
Back Color are applied to the transparent pixels.

Notice if the Material
Back Color is set to transparent, the Cell Back Color (Mapping Group) will appear through the transparent part of the motif. This feature lets you achieve complex color customization when for example you add Cell Padding (Mapping Group) to the motif.
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In all Color Modes, the Colorize slider lets you inject the original image colors in the lighten part of the motif, means the white part of the motif will be fully tinted with the color of the original image.

Colorize - Tint the Mosaic mixing the texture and original footage colors.

Color Mode - Custom - Provides the interface to customize the motif colors. The Front and Back color parameters have 3 modes:

Solid - Apply a color to the front (opaque pixels) or to the background (transparent pixels).

Gradient - Apply a color gradient to the front (opaque pixels) or to the background (transparent pixels). In this mode, a Gradient Steps slider lets you adjust the distribution of the gradient.

Contrast - Apply 2 differents colors to the front (opaque pixels) or to the background (transparent pixels). In this mode, the Gradient Steps slider lets you split the colors at a particular point of the motif.
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When importing your own motif using the “Load Footage” ( Texture Menu of the Material Group ),
2 other parameters appear in the interface :

Create Alpha - Lets you create transparency in an imported texture atlas using the white or black part of the motif. This option helps to assign the Material Back Colors to the transparent pixels.

Invert Colors - Invert the colors of your custom motif.