The toolbox includes several modular interactive tools that you can activate from the command line and use with images displayed in a MATLAB® figure window, called the target image in this documentation. The tools are modular because they can be used independently or in combination to create custom image processing apps.
The following table lists the modular tools in alphabetical order. The table includes an illustration of each tool and the function you use to create it.
Note: The Image Processing Toolbox™ image viewing and exploration app, Image Tool, uses these modular tools — see Display Images with Image Viewer App.
Summary of Modular Tools
Adjust Contrast tool
Displays a histogram of the target image and enables interactive adjustment of contrast and brightness by manipulation of the display range.
Choose Colormap tool
Allows you to change the colormap of the target figure. You can select one of the MATLAB colormaps, select a colormap variable from the MATLAB workspace, or enter a custom MATLAB expression.
Crop Image tool
Displays a draggable, resizable rectangle on an image. You can move and resize the rectangle to define the crop region. Double-click to perform the crop operation or select Crop Image from the context menu.
Display Range tool
Displays the display range values of the associated image.
Displays a draggable, resizable line on an image. Superimposed
on the line is the distance between the two endpoints of the line.
The distance is measured in units specified by the
Image Information toolim
Displays basic attributes about the target image. If the image displayed was specified as a graphics file, the tool displays any metadata that the image file might contain.
Creates a text edit box containing the current magnification of the target image. Users can change the magnification of the image by entering a new magnification value.
Displays the target image in its entirety with the portion currently visible in the scroll panel outlined by a rectangle superimposed on the image. Moving the rectangle changes the portion of the target image that is currently visible in the scroll panel.
Pixel Information tool
Displays information about the pixel the mouse is over in the target image.
If you want to display only the pixel values,
without the Pixel info label, use
Pixel Region tool
Display pixel values for a specified region in the target image.
Save Image tool
Display the Save Image dialog box. Use this to specify the name of an output image and choose the file format used to store the image.
Scroll Panel tool
Display target image in a scrollable panel.