
TRACER: DEMONSTRATION FILES

Two demonstration bitmap files are included in this distribution. You
might find them useful for testing out the Automatic Trace option.
(Note: for 90+% of tracing jobs you will probably use the manual option.)

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LINE.BMP depicts a monochrome logarithmic line plot. This can easily be
traced with the automatic option, using symbol widths and heights of zero.
If you use the Map Coordinates command to obtain true data outputs, remember
to enter the log values (e.g. -1, 0, 1 for x-axis) rather than the anti-log
values which are shown on the image. If you want anti-log output, you can
use the Transfer functions command. This bitmap is also useful for testing
the Border Trace option. For example:

(1) Start Tracer and select an area which includes both the plotted line
and the x-axis.

(2) Click the Trace|Automatic menu item.

(3) Select Overwrite Image with Symbol; select Border Trace; set Recording 
Frequency = 10; click OK.

(4) You should get a result which looks something like the picture shown
in the About Tracer dialog box (on the Help menu).

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POINTS.BMP depicts a monochrome point plot. On the author's system
(800x600 video mode, image expanded to maximum) this graph was easily
traced with a symbol width of 6 px, height of 5 px and channel width of 24
(note: backtracking option was enabled). With a different video mode,
the settings will differ, but you should achieve results of similar quality.
Some of the results are compared with the source data in the listing below:

 True (x,y)        Tracer (x,y)
 data              data

0.1495 0.2328      0.1479  0.2340
0.1814 0.2066      0.1796  0.2082
0.2134 0.1726      0.2113  0.1731
0.2454 0.1393      0.2430  0.1406
0.2774 0.1243      0.2747  0.1250
0.3071 0.1330      0.3064  0.1337
0.3384 0.0958      0.3381  0.0973
0.3704 0.0760      0.3698  0.0777
0.4023 0.0653      0.4015  0.0664
0.4343 0.0562      0.4331  0.0570
0.4663 0.0602      0.4648  0.0607
0.4982 0.0483      0.4965  0.0488
0.5302 0.0483      0.5282  0.0488

The results were not too sensitive to the symbol size parameter.
On the other hand, with a channel width setting of 22 pixels, most of
the points were overlooked by Tracer.
