If you would like general information on the autotrace settings click here. Today I am going to look at the SCAL 2.0 Autotrace Brightness setting in more detail. Below is an image that I found online that I thought would be good for testing the settings.
Bring up the Autotrace dialog box by either clicking on the Trace Image button or through the File menu. The Brightness can have a value of 0-100 with a default of 50. What happens when you increase or decrease this value?
The image below was traced using the default brightness setting of 50. Most of the black lines were traced except for the green fish.
Trace again with a brightness of 40 and all of the black lines trace, but none of the colors.
Finally, trace with a brightness of 75. More of the black lines are not traced.
There was another fish in the original image, so I traced with the two higher settings on that one too. And got similar results from a brightness standpoint.
Lower brightness numbers provide higher brightness/contrast in the trace. If you have an image with colors that are too close in brightness try tracing with a lower number. If you have a trace that is including too much, try increasing the brightness value.