|Description:||The Gallery | Mask Color menu option allows you to define a mask color for the agent depictions currently selected in the gallery. Masks are like filters or films of a given color that cover the cell a depiction inhabits. They are useful, if you wish to make part of the agent depiction transparent. Mask color choices are described below.
The Gallery | Mask Color | None option specifies that the depiction of your agent will have no mask. Agent depictions with no mask completely cover agents below them.
The Gallery | Mask Color | White option specifies that the depiction of your agent will have a white mask. This means that the part of the agent depiction that was white will be transparent. The use of a white mask is good for making simulations where cars drive on roads, for example. Cars travel on top of roads and cover only portions of the road. The rest of the road should be visible underneath the car.
Upper left pixel color
The Gallery | Mask Color | Upper left pixel color option specifies that the depiction of your agent will have a mask of the same color as the upper left pixel of the depiction. Your agent depiction will become transparent at those pixels with the same color as the pixel in the upper left corner of the depiction.
The Gallery | Mask Color | Other option allows you to select a mask color for your depiction. A dialog box will appear (shown below), prompting you to select a color from the available color palette and set it as the mask color.
Command-click on the Select Color box to get the Apple Color Picker, which has controls for Saturation, Hue, and Brightness as well as with controls for Red, Green, and Blue values.
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