Gouraud Shading may be enabled by pressing the GShade button, in the Main Lower Control Panel, before rendering a picture. The button will remain depressed until you again click on it to disable it. There are two methods of dithering available with Vistapro. The first, using the Dither button causes a blending of the elevation colors, reducing the sharpness of the snow and tree lines. This can be changed by clicking on the numerical gadget below the word Dither in the Middle Control Panel, and entering a new value.
Larger values result in more dithering, smaller values result in less dithering.
The second method is called pixel dithering, mixing slightly different colored pixels to simulate more colors. This can be set by clicking on the numerical gadget below the PDthr button on the Main Lower Control Panel, and entering a new value. Larger values result in more dithering, smaller values result in less dithering. You can add so much dithering so as to make the image entirely unrecognizable. Spend some time experimenting with the features we have discussed.