Lesson 7- 4. Tracing color raster
images
Brief
description: During
this lesson you will learn how to trace raster polylines on color scanned
images.
 For detailed information on these subject see chapters Tuning tracing, Tracing Modes and Commands, How
to trace, Tracing
Polylines, in the Tracing section of the Quick Start guide.
Create a new AutoCAD drawing.
Using the Open
command from the rFile menu, load the Trace_color.tif document from the Lesson_7
folder.
Before tracing a polyline you need to tune the tracing parameters.
Choose Conversion Options
from the rConvert menu.
For detailed information on tuning the tracing
parameters see section
Tracing polylines of Lesson
7-2.
However there are some differences when tracing color polylines:
| The Max.Width
setting should be measured exactly on the color boundary of a raster
polyline. Set the value of this parameter slightly greater than the
measured width (i.e. if the measured width is 0.24 - enter 0.4 in
the Max.Width field). |
 |
|
In the Separate tab, enter 0.2 in the Width field, and select
the checkboxes against the Width and Use Table fields.
|
 |
|
Open the Raster To Vector toolbar.
Choose a tracing mode - for example, Make Vector and Keep Raster
by pressing the Make Vector and Keep Raster button,
and the tracing command - Line Following.
|
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|
Tracing polylines on a color image is the same as tracing polylines
on a monochrome image.
For detailed information on tracing polylines see section
Tracing polylines of Lesson 7-2.
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