Using the Palette Editor in Voxx2
To open the palette editor in Voxx2, right-click in the main and choose Palettes.
One of the most important features of Voxx2 is real time palette editing. While learning to use the palette editor is fairly straight forward, desiging good palettes is as much an art as it is a science. Please be patient, it often takes time to create a good palette and remember if you are struggling, try another blending mode. In Voxx2 you have a choice of editing in the RGB or HSB color spaces. RGB is the standard red, green, blue colorspace of most displays. HSB stands for hue, saturation, brightness. Alpha in both cases controls the transparency of a given intensity. An alpha value of 255 is completely opaque, while 0 is transparent. To switch between color spaces click here:
To edit the curves, simply select the corresponding check box and drag the curve into the desired shape. Curves can also be edited with the arrow keys. To move an entire curve instead of a single point hold down Shift. Likewise with the mouse you can move the curve left and right while holding the Shift key or up and down while holding the Control key. The black curve is a histogram of the intensities of the current channel the palette is assigned to. Generally, it often looks like a right-skewed bell curve. Keep in mind some volumes just will not look good no matter how much time is spent manipulating the palettes. Also, note there are Undo and Redo buttons in the upper right hand corner. They are a great way to quickly toggle back and forth and see the effects of your changes.
Palette Management
Palettes can be loaded and saved by right-clicking on the Palette Editor and choosing the corresponding option. Likewise new palettes can be created, or unused palettes closed. Palettes are assigned to channels in the Stack Manager window, which can also be reached by right-clicking. You can switch between palettes with the drop-down list at the top of the window.
Working with HSB
The hue corresponds to a color on the spectrum located to the left of the graph. Saturation determines how "pure" the color is: zero is white, while 255 is the color you see on the spectrum. Brightness is exactly what it sounds like.
The lazy redraw checkbox is useful when rendering extremely large volumes. When checked the main window only refreshes after the mouse is released.