The depth of color supported by the current display mode.
<display>
This reports the number of bits of color in the current display mode.
The following displays the value of colordepth in a text stimulus:
<text sometext>
/ items= ("colordepth = <% display.colordepth %>")
</text>
The following displays the value of colordepth in an instruction page:
<page somepage>
colordepth = <% display.colordepth %>
</page>