Smoothness

Noise in an image can cause contours to be computed for spurious pixels, causing a jumble of contour fragments. This selection controls the sensitivity to noise. A higher smoothness is usually desirable with noisy images.

Cursor ROI

If checked, contouring occurs inside the rectangular region defined by the image cursor.

Add Contours

Check this box to add more contours when you click on the image. If unchecked, then the previous contours will disappear when you click a new contour on the image.

Report Value

If checked, the marked value of the contour is listed in a Text Editor window.

Auto Update

Check this box to automatically update existing image contours when a setting is changed in the preferences dialog.