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We'll use this image of downtown Pasadena, California for most of our selections. It can be done but it takes an extra step, which you'll learn about later.You'll need an image to practice these selection techniques on. That's because the process of selecting is of primary importance, and drawing is secondary. Your mastery of ImageJ depends largely on your ability to make and use selections.If you have used other graphic software, you may be frustrated that you can't draw points, lines, shapes, and text with ImageJ. The phrase 'select, then act' is a cornerstone of many computer applications, and image processing is no exception.In many cases, the instructions won't tell you explicitly what to do, but we urge you to TRY EVERYTHING YOURSELF! Selection is such an important process that there are no fewer than 15 separate tools on the ImageJ toolbar and over 20 menu items dedicated to selections. Another name for a selection is Region Of Interest or ROI.

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Selection В– The selection color is the color used to display selection outlines.The foreground color, not the selection color is used to draw lines and shapes on the image.Selections are indicated by a colored outline. Background В– The background color is the color used for erasing and deleting. Foreground В– The foreground color is the default color for drawing, painting, and filling. For orientation, North is to the right.In ImageJ, there are three colors the user can define: Then, open the image in ImageJ using any of the techniques you've learned. Right-click (PC) or control-click (Mac) the image to download it to your computer.

Choose Edit > Options > Colors and choose a selection color. The default selection color is yellow, but this can be changed to any of eight standard colors (black, white, red, green, blue, cyan, magenta, yellow, and orange). If you have trouble seeing the selection on top of the image (red on red, for example), you might want to change the selection color to something that is easier to see.

Go to the Edit > Options submenu. Double-clicking the Arrow tool opens the Arrow Tool options dialog box. This action is contextual. For example, double-clicking the straight line selection tool opens the line width dialog box. Double-click the tool button itself. There are usually two ways to access these settings:

Operations that require a selection generally display an alert message to that effect. When nothing is selected in an image, most operations assume that you want to use the entire image (ALL of the pixels). In a strange twist of logic, both of these options usually produce the same results.

The only way to cancel the selection is to de-select the image, or to 'select none' of the pixels. When the whole image is selected, there is no 'outside'. You should see a yellow selection outline around the outer border of the image.You may know that you can cancel a selection by clicking anywhere outside the selection. Choose Edit > Selection > Select All. (This is important because if you can't see the edges of the image you won't see the yellow outline around the image when it's selected.) The easy way to fit your image to your monitor is to double-click the magnifying glass tool on the ImageJ toolbar.

Use the Straight Line selection tool to make a straight line selection anywhere in the middle of the image. Before continuing, make sure nothing is selected.Straight line selections are used for measuring length (distance) and angle, and for defining sources for profile plots. (Note: Keyboard shortcuts work except when you're entering text using the text tool, for obvious reasons.) Try these shortcuts out. The keyboard shortcut for Select All is the A key, and the shortcut for Select None is Shift-A. When in doubt, use Select None to cancel all selections.Note that many frequently-used menu items have keyboard shortcuts.

Straight line selections can be dragged beyond the boundaries of the image window. Drag either end handle to move that end of the selection while the other end remains fixed. Drag the center handle to move the selection without changing its length or angle. The small white boxes at the center and ends of the line selection are handles. Positive angles are measured counterclockwise from 0 В° to 180 В° and negative angles are measured clockwise from 0 В° to -180 В°.

(This is the only time nudging will be mentioned, but remember that it works for ALL selections. Arrow Keys В– The four arrow keys are used to 'nudge' selections one pixel at a time to the left, right, up, and down. (AKA 'Propeller' mode) When you are zoomed in on an image, this modifier forces the ends of the line to start and stop on whole number pixel coordinate values (try it to see what this means). Ctrl/Command В– Drag either end of the line to rotate it about its center and change its length symmetrically. Alt/Option В– When dragging an end handle, this keeps the line length fixed while changing the angle. (Very useful when setting the scale.)

For example, can you do both 'radar' and 'propeller' modes at the same time? How about all three?Yes, the diameter of the helipad circle is 15 meters, so you can land your helicopter there in an emergency! If you squint, you can almost see the remains of a sideways H printed in the center of the circle.Segmented line selections are used for the same purposes as straight lines. (not all combinations will work). Test each of these modifiers separately and in combinations. When there is no active selection, the up and down arrows function as 'zoom in' and 'zoom out' shortcuts.)

Create a segmented line selection anywhere on the Pasadena image.Each click defines a new line segment. Right-click (PC) or control-click (Mac) the line selection tool on the ImageJ toolbar and choose the Segmented Line selection tool from the pop-up tool menu. There is a different tool for that purpose.

If you accidentally click too far from a vertex and the selection disappears, use the Restore Selection command. Once selected, the handles at each vertex of the line can be dragged to new locations to refine the selection. (Don't worry, this won't connect the two ends of the selection.) To end the selection, either double-click the last endpoint or click in the small box at the beginning of the line selection.

Alt/Option В– Alt- or Option-click a handle to delete it. Shift В– Shift-click a handle to split it into two separate handles to add more detail to the selection. An aspect ratio of 2.5 means that the width is two and a half times the height. Aspect ratio is simply the ratio of the width to the height of the box. As you drag, the status bar reports information about the bounding box of the selection (the smallest rectangle to completely contain the selection): center (x,y), size (w,h), and aspect ratio (ar). Segmented line selections can be dragged beyond the boundaries of the image window.

To move a freehand line selection, move the cursor over the selection until it becomes an arrow, then drag. To select using this tool, simply click and drag the cursor around the image. Right-click (PC) or control-click (Mac) the line tool button to select the Freehand Line selection tool. Don't use the Freehand Line tool to make freehand area selections В—there is a different tool for that purpose.

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