To generate
a PNG (*.png) file, it is necessary to set the output format properly.
For that open
the "Profile Settings" dialog window (or make use of the "Properties"
window). In the Main section select "PNG, Portable Network Graphics"
from the "Output
Format" list:
VideoCharge Studio is a video editing software which enables to add a text (text watermark) onto a graphics file or every frame of a video film. Here the Stroke effect can be applied to the text.