| Contents |
Analyse/Clear Photometry Results
Area Selection Tools
Use these tools to create area selections that will be operated on separately from the rest of the image. The contents of an area selection can be copied to the internal clipboard, cleared (to white), filled with the current drawing colour, outlined (using Edit/Draw), filtered, or measured. Use the backspace key as a shortcut for Edit/Clear. Use Image/colours to set the drawing colour. Double click on any line tool to change the line width used by Edit/Draw. Use the arrow keys to "nudge" a selection one pixel at a time in any direction.RectangleLine Selection Tools
When creating the selection, drag with the shift key down to constrain it to a square. Use the small "handle" in the lower right corner to resize. Use the arrow keys with the alt key held down to change the width or height one pixel at a time. As a selection is created or resized, its location, width and height are displayed in the status bar.
Creates an elliptical selection. Holding the alt key down forces the selection to be circular. Use the arrow keys with the alt key pressed to change the width or height. As the selection is created or resized, its width and height are displayed in the status bar.
Creates irregularly shaped selections defined by a series of line segments. To create the selection, click repeatedly with the mouse to create line segments. When finished, click in the small box at the starting point (or double-click), and SalsaJ automatically draws the last segment.
The freehand tool lets you create irregularly shaped selections by dragging with the mouse.
Isovaluated Selection Tool
Creates a selection by tracing objects of uniform colour or thresholded objects. To trace an object, either click inside near the right edge, or outside to the left of the object. To visualize what happens, imagine a turtle that starts moving to the right from where you click looking for an edge. Once it finds the edge, it follows it until it returns to the starting point. Note that the wand tool may not reliably trace some objects, especially one pixel wide lines, unless they are thresholded (highlighted in red) using the Image/Adjust/Threshold tool.
Use these tools to create line selections. Use analyse/Measure to calculate the length of a line selection. Use Edit/Draw to permanently draw the line on the image. Change the drawing colour by clicking in the Image/colours window. Double click on any line tool to specify the line width. Use the arrow keys to "nudge" a line selection one pixel at a time.
Use this tool to create a straight line selection. Holding the alt key down forces the line to be horizontal or vertical. To spatially calibrate an image, create a line selection corresponding to a known distance (e.g. 10mm), then enter that distance in the analyse/Set Scale dialog box. PlugIns/Draw Arrow will draw an arrow based on a straight line selection.
Create a segmented line selection by repeatedly clicking with the mouse. Each click will define a new line segment. Double-click when finished.
Select this tool and drag with the mouse to create a freehand line selection.
Create an angle selection by clicking Three times with the mouse. The first twocreate the first straight line of the angle and the last creates the second. The value of the angle is displayed during the construction in the status bar.
Point Selection Tool
Use this tool to create a point selection and to display coordinates and value in a new window. Click once to create a single point selection. Click to add more points. Alt-click on a point to delete it. Double-click on the point tool icon to display the following configuration dialog box.
Use this tool to add text to images. It creates a rectangular selection containing one or more lines of text. Use the keyboard to add characters to the text and the backspace key to delete characters. Use Edit/Draw to permanently draw the text on the image. Use Edit/Options/Fonts, or double-click on the text tool, to specify the typeface, size and style.
Click on the image with this tool to zoom in. Alt-click (or right-click) to zoom out. The current magnification is shown in the image's title bar. Double-click on the magnifying glass icon to revert to 100% (1:1) magnification. There are 20 possible magnification levels: 3.1, 4.2, 6.3, 8.3, 12.5, 16.7, 25, 33.3, 50, 75, 100, 200, 300, 400, 600, 800, 1200, 1600, 2400 and 3200 percent. When zooming in, press the shift key to prevent the window from being enlarged.
Allows you to scroll through an image that is larger than its window. When using other tools (except the text tool), you can temporarily switch to this tool by holding down the space bar.
Sets the foreground drawing colour by "picking up" colours from images. The colour of this tool's icon changes to match the drawing colour. colours can "picked up" from the Image/colours window using any tool. Alt-click in the Image/colours window to change the background colour. Double-click on this tool to display the Image/colours window. he icon for this tool is drawn in the current foreground colour and the frame around it is drawn in the current background colour.