KNK Zing Air - Monochrome Trace of a PNG File with a Transparent Background

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 To have only one trace line, increase the Single Line Threshold setting until there is only a single line
showing in the Preview window:
 Because the T-shirt image is a simple closed shape, the Blackout option could have been used instead of
Single Line Threshold:
 However, if the T-shirt had internal details, such as a pocket, then Blackout could not be used as the entire
pocket would have been ignored. In this sitution Single Line Threshold is the better choice:
7.03.6 Monochrome Trace of a PNG File with a Transparent Background
 PNG files with a transparent background are the easiest files to trace because the software can readily
identify where the invisible background starts and ends. Furthermore, when you load a PNG file into the
Trace window, an option will pop up if a transparent background is identified:
Single Line Threshold = 0
double line
Single Line Threshold = 5
double line
Single Line Threshold = 10
single line
With Blackout unchecked
With Blackout checked
Original image
Preview of trace with
Blackout
checked
Preview of trace with
Single Line Threshold
increased