Tracing Contour Lines in Photographic Images

select an image

change the gray-level values of the contoursby moving the ◆ locators

◆

choose a color scheme

SunsetColors

contours only

This Demonstration draws contour lines of equal gray-level intensity in a black-and-white photographic image. The slider with multiple locators can be used to set the gray levels of the contours. Additional contours can be added or deleted by pressing the ALT key while clicking inside the slider. Different color schemes can be selected for contour shading. You can also click the checkbox to show the contour lines only.