Lesson 5. Editing Raster Images
Brief
description: During this lesson you will learn about the different
methods of editing raster images within WiseImage. We also take a look
at using the Tracing operation as a means of editing a raster image.
 For detailed information on these subjects
see the following sections of the
Quick Start guide:
Editing data selected with object selection methods, Raster snap,
Tracing
Hatches.
Let’s look at this example of modifying a section of
the raster image.
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Before editing the raster image
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After editing the raster image
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Editing raster objects
Choose Open from the File
menu. Open the Image.dwg file from the Lesson_5
folder.
- Select the raster circle. Complete the command by pressing Enter
and clicking on the selection - the selected circle will obtain
"grips".
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- Open the Properties dialog (choose Properties
from the Tools menu).
- In the corresponding fields of the Properties
dialog:
- Change the radius from 9.16 to 7 mm.
- Change the line width to 0.6 mm.
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- Select the line and move it to the new position, as shown.
- Do the same for the second line, so that it touches the opposite
side of the circle.
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TIP:
When executing these operations you can use running snap or
Snap on demand to the raster objects.
- To turn on running snap to the raster:
From the rImage menu, choose Snap
and then Raster Snap On;
select Running Snap in the Object
Snap tab of the Drafting Settings dialog
of AutoCAD.
- To turn on snap on demand to the raster:
Simultaneously press Ctrl and the right mouse button, and choose
Raster Snap from the list.
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- Select the arc, using forced selection of arc by three points.
Move and stretch it by grips.
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- Select the next line and move it, as shown.
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- Select the
highlighted lines one by one and, using the grips, stretch them
to the circle edge.
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Using tracing for editing
Method 1
| As a result of the modifications to the circle &
surrounding lines, the hatch needs repair. To correct the hatch you
can trace it in Smooth Raster mode. |
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- Open the Raster To Vector toolbar, press the
Trace hatch and Smooth Raster buttons.
- Cross the hatch lines by fence. Click to complete the operation.
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Before tracing
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After tracing
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Method 2
- Make Vector and Erase Raster mode.
Press the Trace hatch 
and Make Vector and Erase Raster
buttons on the Raster To Vector toolbar. Now cross
the hatch by fence again.
- You can select the vector hatch, and then edit it using AutoCAD’s
Properties dialog.
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- If needed, you can rasterize the edited vector hatch.
To rasterize vector objects:
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- Choose the color(s)
of vectors you want to rasterize from the list of V2R Options dialog, and in the Line
Width box assign a width for the line when converted to
raster.
- Press OK.
- Choose the vector hatch.
- Choose Vector to Raster from the rConvert
menu.
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