#!F-adobe-helvetica-medium-r-normal--18* #!N #!CDarkGreen #!N #!Rall24 Specifying Colormap Values #!N #!EC #!N #!N You can specify a Colormap value in two ways: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o Directly by manipulating a control point. #!N #!I30 #!N o Indirectly through the #!F-adobe-times-bold-r-normal--18* Add Control Points #!EF dialog box. #!N #!I0 #!N #!EF #!N The first is quick and approximate. The second is slower and precise. #!Cbrown #!N #!F-adobe-times-medium-r-normal--18* #!Rcmaped9 #!N Graphics omitted from Online Documentation. Please see the manual. #!N #!N Figure 9. Colormap Editor for .../example1.net. The four image characteristics controlled by the editor (hue, saturation, value, and opacity) are also listed in #!Lcolmped1,dxall24 t Table 1 #!EL . The numerical range for each is 0.0-1.0. For #!F-adobe-times-bold-r-normal--18* Hue #!EF this range is "r g b r" (red green blue red); the current setting corresponds to the red-green-blue spectrum of the color column to the left. The column furthest left (RGB) displays the red-green-blue color values corresponding to the four settings on the right. Note that each setting is determined by a "line" whose position can be changed by moving the "control point" at one of its ends; the shape of the line can be modified by adding control points (see text). The values 0.0 and 2.5000000 are the minimum and maximum of the data values used in the visual program. #!EF #!N #!EC #!N #!N #!F-adobe-times-bold-r-normal--18* Specifying approximate values: #!EF #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Position the mouse cursor in the middle of the large #!F-adobe-times-bold-r-normal--18* Value #!EF rectangle and #!F-adobe-times-medium-i-normal--18* double click #!EF the left mouse button. Note the changes that result: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o A new control point appears (turning the vertical line into two line segments) and the #!F-adobe-times-bold-r-normal--18* Value #!EF button is activated. #!N #!I30 #!N o The data value of the new point is displayed in the data range next to the color column (the RGB area, color column, and image show corresponding changes). #!N #!I0 #!N #!EF #!N #!N #!I30 #!N 2. To move the control point, use the left mouse button to drag it. The RGB area, color column, data value, and image all change accordingly. #!N #!I30 #!N 3. To return Value to its previous state, double click on the control point. #!N #!I0 #!N #!EF #!N #!F-adobe-times-bold-r-normal--18* Specifying exact values: #!EF #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Select #!F-adobe-times-bold-r-normal--18* Edit #!EF in the menu bar of the Colormap Editor and then select #!F-adobe-times-bold-r-normal--18* Add Control Points #!EF in the pull-down menu. A dialog box appears (see #!Laddcon10,dxall25 f Figure 10 #!EL ). #!Cbrown #!N #!F-adobe-times-medium-r-normal--18* #!Raddcon10 #!N #!N Graphics omitted from Online Documentation. Please see the manual. #!N Figure 10. Add Control Points Dialog Box. This dialog box has two interactors: The first specifies the actual data value for which a corresponding set of Colormap values are to be implemented. The second specifies one of the four Colormap values, such as #!F-adobe-times-bold-r-normal--18* Hue #!EF in this example (see text). #!EF #!N #!EC #!N #!I30 #!N 2. Click on the #!F-adobe-times-bold-r-normal--18* Saturation #!EF rectangle of the Colormap Editor. The label button in the editor is activated (recessed) and the new interactor label in the #!F-adobe-times-bold-r-normal--18* Add Control Points #!EF dialog box changes to "Saturation value (0.0 to 1.0)." #!N #!I30 #!N 3. Click on the data value displayed in the dialog box, type in the value 1, and press #!F-adobe-times-bold-r-normal--18* Enter #!EF . The new value is displayed as 1.00000. #!N #!I30 #!N 4. Click on the saturation value displayed in the dialog box, type in the value #!F-adobe-times-bold-r-normal--18* . #!EF 28, and press #!F-adobe-times-bold-r-normal--18* Enter #!EF . The new value is displayed as 0.28000. #!N #!I30 #!N 5. Click on #!F-adobe-times-bold-r-normal--18* Add #!EF in the dialog box: A control point corresponding to the new values in the dialog box appears in the #!F-adobe-times-bold-r-normal--18* Saturation #!EF rectangle of the editor. The RGB area, color column, and image all change accordingly. #!N #!I0 #!N #!EF #!N #!N #!N Now that you know how to open and execute visual programs and to control the images they generate, you can proceed to Tutorial II, which deals with various techniques for visualizing data. #!CIndianRed #!N #!N #!N #!F-adobe-times-bold-r-normal--18* Additional Notes on Control Points #!N #!N #!F-adobe-times-bold-r-normal--18* Displaying Control Point Values #!EF #!N #!N By default the Colormap Editor displays the values of all control points. To display the value of an individual point: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Select in order: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N a. #!F-adobe-times-bold-r-normal--18* Options #!EF in the menu bar of the ColorMap Editor #!N #!I30 #!N b. #!F-adobe-times-bold-r-normal--18* Display Control Point Data Value #!EF in the pull-down menu #!N #!I30 #!N c. #!F-adobe-times-bold-r-normal--18* Selected #!EF in the pull-down list. #!N #!I0 #!N #!EF #!N #!N #!I30 #!N 2. Click on the desired control point in the ColorMap Editor (the rectangle containing the control point is automatically activated if it is not already activated). The data value corresponding to the selected control point appears in the data range next to the color column. #!N #!I30 #!N 3. Repeat the preceding selection procedure, except click on #!F-adobe-times-bold-r-normal--18* All #!EF in the pull-down list (instead of #!F-adobe-times-bold-r-normal--18* Selected #!EF ). Data values for all control points in the #!F-adobe-times-medium-i-normal--18* activated #!EF rectangle now appear in the data range. #!N #!I0 #!N #!EF #!N #!N #!N #!F-adobe-times-bold-r-normal--18* Deleting Control Points #!EF #!N #!N You can delete control points one at a time or in groups: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o To remove control points one at a time (in an activated rectangle), #!F-adobe-times-medium-i-normal--18* double click #!EF on each point to be removed #!N #!I30 #!N o To remove two or more points at a time: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Select points by either: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N - Shift-clicking: Press the Shift key and click on each point to be deleted; #!F-adobe-times-medium-i-normal--18* or #!EF #!N #!I30 #!N - Drawing a selection box: Hold down the left mouse button and drag the cursor to generate a "selection box" in the selected rectangle and enlarge it to the desired size. Release the button (the box disappears, but any "boxed" points are selected). #!N #!I0 #!N #!EF #!N #!N #!I30 #!N 2. Select #!F-adobe-times-bold-r-normal--18* Edit #!EF in the menu bar and then #!F-adobe-times-bold-r-normal--18* Delete Selected Control Points #!EF in the pull-down menu. All selected control points are deleted and the image is updated. #!N #!I0 #!N #!EF #!N #!N #!I0 #!N #!EF #!N #!N #!N #!EC #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lapg,dxall26 h Tutorial II: Editing and Creating Visual Programs #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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