Performs densitometry on a Bezier curve one pixel thick. Click on the desired control points. These are indicated by small boxes which can be repositioned by dragging to different locations. Pressing 'Space' will create a graph of pixel intensities along the Bezier curve. Click on Cancel when finished.
Because the line is one pixel thick, the graph will be noisier than other types of densitometry. Future versions of imal will be able to perform curve densitometry on arbitrarily thick lines. Evaluating thick curve densities is not trivial however, because pixels will be oversampled in concave parts of the curve and undersampled in convex parts.