SAS/SPECTRAVIEW Software User's Guide

Introduction

When you load data, the software automatically

sets default response value ranges
color codes those ranges with preset colors.

These are the colors displayed when you create an image with a visualization technique. For example, for response values that are loan payments, the highest range of payments may be preset to red and the lowest range of payments may be preset to blue.

To meet individual needs, you can customize both the ranges and the mapped colors. You can also specify a color for missing values (which are by default transparent) so that you can see their locations in an image as well.

To set colors for an image, select [Palette], which displays the software's color palette. By default, [Data ramp] is automatically selected, which displays the response value ranges and preset colors located below the text window as shown in Color Palette:

Color Palette

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When you are working with colors, any previously requested image remains displayed in the Volume window and will display your color specifications so that you can easily see the effects.

Note: Using the color palette, you can also specify colors for an isosurface (explained in Viewing a Response Value as an Isosurface) and various image customizations, such as axis labels, lines for axes, the bounding box, and text included in an image (explained in Customizing an Image). [cautionend]

Specifying a Color with RGB Sliders and Color Chips

When you select [Palette], the software automatically provides RGB sliders (located under the label RGB VALUES) and color chips (located below the RGB sliders). You use either the sliders, the chips, or both to select a color for response value ranges and for other SAS/SPECTRAVIEW items like tick marks, an isosurface, and so on.

Using the RGB Sliders

The sliders allow you to set the percentage of red, green, and blue to create a particular color. For example, the RGB values of 0, 0, 0 define black; 100, 100, 100 define white; and 0, 100, 0 define green.

The first slider sets the percentage of red, the second sets the percentage of green, and the third sets the percentage of blue. The resulting color appears in the square to the left of the RGB sliders.

RGB Sliders

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Using Color Chips

To select a color from the color chips, simply click one. The color appears in the square to the left of the RGB sliders and is reflected in the RGB slider values. Note that you can select a color chip, then refine the color with the RGB sliders.

The colors shown in the three rows of chips represent possible combinations that you can obtain by moving one of the three RGB sliders. The top row of color chips corresponds to the possible colors that can be defined by moving the top (red) slider. Similarly, the other two rows of color chips represent the effects of changing their corresponding RGB slider.

Color Chips

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