The Control Panel is launched automatically when ImageWorks is started. If it is popped down, it can be popped back up by selecting Tools|Control Panel (choose ``Control Panel'' from the ``Tools'' menu).
The top section of the Control Panel is the cursor area. On the Cursor title bar is an option menu controlling the cursor coordinates to be displayed beneath the title bar. The possible cursor coordinate values are Display (for display coordinates), Database (for current file coordinates), Geocoded (for georeferenced coordinates if possible), and Geographic (for geographic (Lat/Long) coordinates). See the Cursor Control section for a more detailed explanation of these four options.
Beneath the cursor title bar are the cursor coordinates in the current selected grid system. These fields are output only, but the coordinates may be updated on the Cursor Control panel. On occasions when it is impossible to translate the cursor position into the requested coordinates, the cursor position will be blank.
Below the cursor position are three fields indicating the digital image values of the pixel pointed to by the cursor. Each of these values is separated from the image plane to which it corresponds by a colon. The image planes selected for the Red, Green, and Blue colour guns are the ones displayed.
Beneath the Cursor area is the Image Control area. The overall display mode of ImageWorks is set using the pull down menu on the ``Imagery'' title bar. The `Off' button disables the display of imagery. The `RGB' button enables the three plane RGB display mode. The `BW' button enables the black and white display mode. Black and white display mode is the same as RGB mode, except that all three colour guns are locked on the same image plane. The `PC' button enables the Pseudocolour display mode in which one image plane is run through a Pseudocolour Table (PCT) to produce a colour image. This colour image may appear black and white if a grey scale is used in the Pseudocolour table.
Below the Image title bar is the image plane to colour gun mapping table. Each image plane (to a maximum of 8) has a numbered column in the table with three rows, one for each colour gun. In each row, exactly one image plane will be selected indicating the source of data for the colour gun. The selected image plane is highlighted in the colour of the corresponding colour gun. To view more image planes beyond the first eight, use the Image Info panel, or the DCP PACE program.
For example, the following would indicate that ImageWorks is using image plane one for red, image plane two for green, and image plane three for blue; image plane four is currently not displayed.
Image plane: 1 2 3 4 Red X o o o Green o X o o Blue o o X oThe Graphics area is used to enable and disable the display of graphic planes easily. The ``All On'' and ``All Off'' buttons on the title bar are used to enable or disable all the graphic planes at once. The buttons under the title bar are used to enable or disable one graphic plane at a time. The graphic planes are enabled when they appear depressed. If there are no graphic planes available this area will be missing from the Control Panel.
The Vectors area is used to enable and disable the display of vector layers easily. The ``All On'' and ``All Off'' buttons on the title bar are used to enable or disable all the vector layers at once. The buttons under the title bar are used to enable or disable one vector layer at a time. The vector layers are enabled when they appear depressed. No more than eight vector layers can be controlled from the Control Panel, and blank buttons indicate that no corresponding vector layers yet exist.
The Enhancements area is used to apply quick enhancements to the currently visible image planes. This is done by creating Lookup Tables (LUTs) to improve the contrast of the imagery. The `No Enhancement' button sets the LUT for each of the image planes to a linear ramp. This results in no changes to the imagery data values.
The Infrequency, Linear, Equalization, Adaptive, and Root buttons apply various curves to the LUT, based on end points between which the curve is applied. The end-points are computed by examining the histogram of the sub-window of image data showing in the main image window, ignoring values of 0 and 255, and applying a 2% tail trim. The infrequency enhancement does not apply a 2% tail trim.
To better visualize the LUT that these enhancements are creating, pop up the LUT Editing panel (from the Edit pulldown menu) before applying the different quick enhancements on the control panel. This panel is discussed in more detail in the LUT Editing subtopic.
The Enhancements area also contains 3 buttons to control the brightness and 3 buttons to control the contrast.
The last area of the Control Panel is the Zoom area. Located on the title bar is a Zoom Level Control. The pull down menu allows you to select the magnification value. The `off' selection indicates ``overview'' mode which means that an overview of all the data in memory is being shown. This is the same as magnification level 1, if the size of the data in memory is the same as the size of the window in which it is being viewed.
Beneath the zoom title bar is a graphic representation of the current view window. The outer box, a slight indentation, represents the area of all the data in memory. The black box inside indicates the window of data currently being viewed in the main image window. When the view is zoomed in, the inner box will only contain a small part of all the data. This inner box can also be grabbed and dragged with the mouse cursor to change the view window.
See Also: Cursor Control, Image Info, DCP