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Chapter 8: Traces
Fill Color
The second color button in the Attributes dialog shows the current fill color if one
consistent color is defined among all traces. Clicking on the button will open the Color
dialog with a separate set of Custom colors for fill colors. These values are also saved
with the series and can be set as well in the Tracing tab of the Series Options.
Fill color defines the shading for the interior of a closed trace. An open trace is not filled.
The fill color can be any red-green-blue combination but the appearance of the fill is
affect by both the choice of color and the fill mode.
Fill Style
The style of filling can be modified with the checkboxes in the dialog. A closed trace can
be either filled when it is selected, when it is not selected, or not filled at all. An open
trace is never filled.
Normally, the interior of traces are filled when the trace is selected, and unfilled when the
traces are not selected. To turn off the filling of traces completely, change the Fill mode to
be None.
The selected traces are filled when they are not selected by checking that box in the
Attributes dialog. The trace will be given a transparent interior when they are selected.
This is useful for showing particular regions as highlighted on the sections or in the
thumbnails.
The Fill mode determines how the fill color will be combined with the underlying image or
other trace data to produce the final display. A Fill mode of Solid will color the interior with
a solid color, no image data will be visible. A Fill mode of None means that no filling will
be applied to trace regions.
Darken fill mode sets the display to a combination of the colors common to both the fill
color and the underlying image, such that a fill color of white would result in a completely
transparent fill while a black color would result in a solid black fill. A pure blue (0,0,255) fill
on a grayscale image would result in shades of blue replacing the grayscale. Lighten
uses a combination of the fill color and the image color such that the opposite effect is
produced. Black fill results in transparency, while white fill color produces a solid white
interior. The basic colors that have either 0 or 255 for the red, green, and blue channels
work best for fill modes using Lighten or Darken.
Hidden
A trace can be hidden from view in a section by checking the Hidden checkbox in the
Attributes dialog. A hidden trace will not be drawn in the main window but will appear in
the trace list with a special "H" icon (Fig. 8.6). To unhide a trace simply select it from the
Trace List, or use Unhide from the list Modify menu.
All traces can be hidden at once whenever a section is first displayed by using the
checkbox in the General tab of the Series Options. To prevent a permanent change to
the section, make sure the Autosave checkboxes for sections are unchecked as well.
Subsequently paging through the series will result in sections being displayed without any
visible traces. Go back to the General tab and uncheck the "Hide all traces when loading
section" box. Subsequent paging will display the traces again. If the traces remain hidden,
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