Colorization maps pixel values to colors for display. Within the user-configurable Value Range, values are mapped through a Value Map that applies a logarithmic, linear, or exponential function. Then, the value-mapped values are mapped through three Color Maps, using either Red, Green, and Blue (RGB) or Hue, Saturation, and Value (HSV or sometimes HSB for Brightness) Color Space. The Color Maps are defined using multiple knots and piecewise linear or cubic spline interpolation. The three color maps define a wheel that can be rotated with a Color Shift. Values outside the Value Range are set to Extrema Colors.
Open the Colorize tool by either clicking the Colorize button
on the Image Viewer tool bar or selecting View->Colorize on
the Image Viewer menu bar.
Step 1: Enter the minimum (Min) and/or maximum (Max) values
defining the value range in the text boxes in the upper-right corner
of Colorize. Type the ENTER or RETURN key on the keyboard to
enter the values.
Step 2: To apply the value range to the image, click the Apply button or the OK button.
Step 1: Select either automatically assigned (Auto) or user-specified
(Custom) Extrema Colors. (Automatically assigned Extrema Colors
are set to the colors of the minimum and maximum values.)
Step 2: For Custom Extrema Colors, click the left color box
to set the color for values less than the minimum and the right color box
to set the values greater than the maximum value. GC Image launches a
color chooser.
Step 3: In the color chooser, set the desired color using swatches, HSB sliders, or RGB sliders, then click the OK button.
Step 4: To apply the Extrema Colors to the image, click the Apply button or the OK button.
Step 1: Slide the Value Mapping slider left for logarithmic
value mapping or right for exponential value mapping or click the Value
Mapping button for linear value mapping.
Step 2: To apply the Value Mapping to the image, click the Apply button or the OK button.
Step 1: Click the "Automatic" radio button under Value Mapping
Note: In Automatic mode, previous parametric settings are ignored. To go back to parametric value mapping settings, click the "Parametric" radio button.
Step 1: Select either RGB or HSV Color Space.
Step 2: Define the three color mapping functions by clicking to
add to or reduce the number of knots, click-and-drag the knots to the
desired positions, and choosing linear or spline interpolation through
the knots.
Step 3: To apply the Color Mapping to the image, click the Apply button or the OK button.
Step 1: Enter a name for the color map in the Import/Export
Colormap textbox.
Step 2: Click the Export button.
Step 1: Select a color map from the color map list.
Step 2: Click the Import button.