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When the ROI box is selected it will turn red and 4 smaller boxes will be placed around the ROI so you can
resize it.
If you hold CTRL
down when resizing the
ROI will maintain a perfectly round shape.
If the donut ROI is used to select
or analyse a part of an image, the image is only selected or analyzed
between the two circles. The "donut hole" is not used in the
processing.
>If you
right-click inside the ROI it
will display the ROI property page.
The "Color" and
"Highlight color"
options allow you to change the color of the ROI box.
The Thickness
allows you to change the
width of the ROI box line. The higher the number the thicker
the
line.