Lesson 4. Raster selection

Brief description: To perform operations such as modifying an object’s properties, you first need to select data to apply commands to. During this lesson you will learn how to select raster, vector and hybrid data for further editing.

For detailed information on these subjects see Raster Selections section of the Quick Start guide:

Raster selection - Information

When selecting data, you must define these three selection parameters:

  • Selection type - raster objects or area selection
    Use object selection, if you want to edit the properties of a selected object or modify it using grips.
    In all other cases it is better to use area selection.
  • Selection mode - add data to selection, remove from selection or single selection.
  • Selection method

The selection tools are located on the Select and More Select toolbars.

Selection type - raster objects or area selection

On the Select toolbar press the appropriate button to select:

 Object selection (raster objects with "grips")
Area selection (the result - area selection)

Selection mode - add data to selection, remove from selection, or single selection

On the Select toolbar press the appropriate button to:

 Add data to selection
Remove from selection
Single selection (every new selection deselects previously selected data)
Deselect all selected raster data

Selection methods

  • Inside window or polygon

The result always represents raster area selection.

  • Isolated data by picking

The result always represents raster area selection.

  • Raster objects (lines, arcs, circles) - Object selection


With the Enable Raster Object Producing button pressed, the result represents raster objects with "grips".

  • Raster objects (lines, arcs, circles) - area selection


With the Disable Raster Object Producing button pressed, the result represents raster area selection.

  • Raster segments

Segment - means a raster line of arbitrary shape, limited by intersection points with other raster lines or endpoints.

The result always represents raster area selection.

  • Isolated raster fragments

The result always represents raster area selection.

Raster selection - Exercises

Choose Open from the rFile menu. Open the Selection.cws document from the Lesson_4 folder.

1. To tune the selection parameters, choose Conversion Options from the rConvert menu. Then open the Options tab from the R2V Conversion Options dialog.

  • Measure the width of a raster line using the Measure Value ruler, located near the Max Width field.
  • Set the value of Max Width slightly greater than the measured width (i.e. if the measurement result is equal to 1.35 - enter 1.5 in the Max.Width field).
  • Set the Approximation Accuracy slider to the Low position.
  • Press OK.

2. Select the raster circle by picking.
On Raster select toolbar:

  • Press the Select Raster Object Auto button.
  • The Select Single & Enable Raster Object Production modes are usually used by default - so in this example, you do not need to press the appropriate buttons.
  • Complete the command by pressing Enter and click on the selection - the selected circle will obtain "grips".
  • Open the AutoCAD Properties toolbar.
  • Change the line width in the Width field.
  • Change the line radius in the Radius field.
  • Change the coordinates of the circle center in the Center X field.
  • Unselect the circle by pressing the Unselect All button on the Select toolbar.       

3. Select fragments of the raster line and circle using Forced Selection:

  • Press the Select Add button (to add data)
  • Press the Select Raster Line button, and then select several fragments of the raster lines by specifying two points on each line (start & end points).
  • Press the Select Raster Arc, and then select the raster arc by three points (start, middle & end).
  • Complete the command by pressing Enter and click on the selection - the selected objects will obtain "grips".       

4. To obtain area selection when selecting the circle, press these buttons on the Raster Select toolbar:

  • Select Raster Object Auto
  • Disable Raster Object Production
  • Select Single (usually used by default)
  • Specify the circle by clicking it with the cursor.        

5. Select the raster dimension lines:

  • Press the Select Raster Fence button (with object type recognition), and then cross all the raster objects to select.
  • The Select Single with Enable Raster Object Production mode is usually used by default - so in this example, you do not need to press the appropriate buttons.
  • Complete the command by pressing Enter and click on the selection - the selected lines will obtain "grips".       
NOTE: In the above example, you can modify the properties of objects or apply commands to all selected objects at once.

If you want to work with each selected object separately:

  • Open the AutoCAD Options toolbar by choosing Options from the Tools menu.
  • Open the WiseImage Pro tab.
  • Clear the Selection grouping checkbox in the Additional settings section.       
Now, you can modify properties and apply commands separately for each object included in the selection.

6. Select raster data with crossing window:

  • Press the Select Raster Cross Window button (with object type recognition), and specify a window on screen by two points.
  • You can use either Enable Raster Object Production, or Disable Raster Object Production.
TIP: Having selected a group of objects, if you now want to deselect some of them, we recommended you use area selection - press the Disable Raster Object Production button.

7. Select raster objects inside window:

  • Press the Select Raster Inside Window button (with object type recognition), and then specify a window on the screen using two points.
  • You can use either Enable Raster Object Production, or Disable Raster Object Production.
  • You can use either Select Single or Select Add mode.       

8. Select isolated raster objects (texts) inside window:

  • Press the Select Raster Inside Window (floodfill) button on the More Raster Select toolbar, and then specify a window on the screen using two points.       

9. Select raster lines of arbitrary shape by fence:

Choose Open from the rFile menu, and load the Selection2.tif file from the Lesson_4 folder.

  • Press the Select Raster Fence (linefollow) button on the More Raster Select toolbar.

As the document now comprises two raster images, the Select Image dialog appears, and you need to specify the image on which to select data. Select the checkbox for Selection2 and press OK.
  • Cross the curves to select with a fence.
  • Complete the command by pressing Enter.       

TIP: If you want to add other segments of the polyline to the selection, press the Select Add  button on the Select toolbar, and repeat the selection process.

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