In addition to image channels, bitmap segments may also be accessed by Modeling expressions. The specification of a bitmap is exactly the same as of a channel, except that the special symbol "%%" is used.
The following example will clear any pixels in a database channel that are not under a mask, where the mask is a bitmap segment in database segment 5.
%1 = %1 * %%5
Each point in a bitmap may only have the values one or zero, the assignment of any non-zero value to a bitmap is treated as setting the bitmap pixel to one.
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