In the preceding sections we were modifying single raster images that were selected for editing operations automatically, as the Auto select single file documents configuration option has been checked. Whenever SuperEdit operates on a multi-file composite document, the subdocuments to be affected by the editing operations must be selected by the user.

Click the Open button on the Main toolbar, for File Type choose Tessel Composite Doc (TCD), and open the townmap.tcd document in the DOC subdirectory. Note that Raster toolbar consisting of raster editing buttons, like Clear , Move , etc., is disabled (grayed).

Select townmap1.tif by double clicking the townmap1.tif name on TCD Contents window using the left mouse button. Repeat the action with townmap4.tif . The names of the selected nodes in TCD Contents window become bold. The selected subdocuments in Drawing window will be marked by the rectangles of their viewports drawn with rectangular tracker marks at their corners and midpoints. You should see the SuperEdit window as shown in the figure above.

Double click the townmap3.tif name on TCD Contents window and then double click it again. Notice that the second double click deselects townmap3.tif .

If you want to check the selection status on the Subdocuments list, or it is more convenient to do the selection there, click the Image properties button on Main toolbar. The Composite Document dialog will show the two selected entries of the Subdocuments list, townmap4.tif and townmap1.tif , preceded by the S selection mark and displayed in red, as shown in the next figure.

You may combine both methods of selecting:

structural - clicking nodes on TCD Contents window;

from the list - using the Image Properties button, highlighting the drawings on the Subdocuments list and clicking the Select and Unselect buttons in the Composite Document dialog.

Close the Composite Document dialog, click the Clear rectangle button on the Raster toolbar. Define a large rectangle around the center of the map, so that it includes portions of all four (4) segments of the map. Use the right click to display the pop-up menu and choose OTM Accept option to accept the clearing operation. After the image regenerates, you should see that the editing operation has affected only the two (2) selected images, leaving the others unchanged.

Click the Undo button on the Main toolbar. The last editing step will be cancelled for both selected images. Double click the both images on TCD Contents window. SuperEdit will return to the nothing-selected state and the Raster toolbar will be disabled (grayed).