to design a polyline, but to learn you need two points only. Now if you approach pointer close to segment ranging between the two points, the little ‘+’ close to pointer changes into a cross (for moving) press down right button moving pointer to any side. Then two events occur: one is a bending of the segment to moving direction and this bending is proportional with displacement, and the second reveals at curved. A path all of whose segments are straight is called ‘polygonal’. When you create a path segment, it starts out straight, because the handles for the anchor points are initially placed directly

line segment, the “+” changes into a cross with arrows; like the move tool. Move the mouse cursor close to a line segment, left-click and drag the line segment. Two events occur. • The line segment bends Each line segment has a start point and an end point that is clearly labeled. A “direction line” now projects from each end point for the line segment that was moved. The curved line segment leaves an “direction line” leaves the end point. The length of the “direction line” controls how far the line segment projects along the “direction line” before curving toward the other end point. Each “direction line”

Left endpoint color L Flip segments F Load from left neighbor’s right endpoint Ctrl + L Replicate segment M Blend endpoints’ colors B Load from right endpoint Alt + L Blend endpoints’ opacity Ctrl + B FG color Alt + F Segments Split segment at midpoint S Split segment uniformly U Delete segment D Recenter segment’s midpoint C Redistribute han- dles in segment Ctrl + C C H A P T E R 3 Don’t Underestimate where you put your splines! Also, don’t use too many splines. You only need one for each curve segment, so adding too many to the Bezier curve will just make it harder to create the final selection shape

Lecture 2 – March 3, 2021 In-Class Activity: Segmentation Using GIMP Introduction • We will manually segment an image from the XCT dataset of Al-Zn solidification using GIMP • In supervised machine learning entire copy image to make it completely black 5 In-Class Activity: Segmentation Using GIMP Segment the dendrites • Change the color to white using the toggle in the “main toolbox”, or by pressing studying phase transformations • Use the GIMP software to segment images Next… • One of the exercises in the laboratory is to manually segment two difficult images • Next lecture will cover the fundamentals

curved. A path all of whose segments are straight is called "polygonal". When you create a path segment, it starts out straight, because the handles for the anchor points are initially placed directly points, yielding handles of zero length, which produce straight-line segments. You can make a segment curved by dragging a handle away from one of the anchor points. One nice thing about paths is that concept behind it is that a gradient can be decomposed into a series of adjoining segments, with each segment consisting of a smooth transition GNU Image Manipulation Program Generated by docbook2odf Page