![]() ![]() Use the segmented line tool to trace the route of the river.Straighten Straightens curved selections made with the segmented line selection tool.Specify Opens a dialog box that lets you specify the height, width, and location of a rectangular or oval selection.For example, if you select a circle then choose Make Band, the selection will resemble a donut (D'oh!) Make Band Takes an area selection and makes a band around the perimeter a specified number of pixels wide.Positive values make the selection larger and negative values make it smaller. Enlarge Grows (expands) a selection by a specified number of pixels.Rotate Rotates a selection the specified number of degrees.The available selection colors are black, white, cyan, magenta, yellow, red, green, blue, and orange. Properties Opens a dialog box that lets you set the stroke (line) color, fill color, and width of the selection outline.Create Mask Creates a new 8-bit image called "Mask" whose pixels have a value of 255 inside the selection and 0 outside the selection.Create Selection Creates a selection from a thresholded image.Select the green pixels, then choose Make Inverse to select the non-green pixels.) This is very useful when you want to make measurements of the pixels in complementary regions of the image. The pixels that were outside the selection are all now inside the selection. Make Inverse Creates an inverse selection.The polygon shape made by the rubber band is a convex hull. Think of drawing the polygon on a board, pounding in nails at each vertex, and putting a rubber band around the nails. Convex Hull Replaces a polygon or freehand selection with its convex hull. ![]() The ellipse will have the same area, orientation, and centroid as the original selection.
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