Autodesk 12812-051462-9011 User Guide 3 - Page 546

Pyramidal Requires less memory and is adequate for most purposes. Summed Area Requires much more memory, but yields generally superior results. None Turns off filtering. Mono Channel Output group Some parameters, such as opacity or specular level are a single value as opposed to a material's three-value color components. Controls in this group determine the source of the Output mono channel in terms of the input bitmap. RGB Intensity Uses the intensity of the red, green, and blue channels for mapping. The color of the pixels is ignored and only the value or luminance of the pixels is used. The colors are computed as gray values in the range between 0 (black) and 255 (white). Alpha Uses the intensity of the alpha channel on page 7905 for mapping. RGB Channel Output group The RGB Channel Output determines where the output RGB part comes from. The controls in this group affect only maps for material components that display color: Ambient, Diffuse, Specular, Filter Color, Reflection, and Refraction. RGB Displays the full color values of the pixels. (Default) Alpha as Gray Displays tones of gray based on the levels of the alpha channel. Cropping/Placement group The controls in this group let you crop the bitmap or reduce its size for custom placement. Cropping a bitmap means to reduce it to a smaller rectangular area than it originally had. Cropping doesn't change the scale of the bitmap. Placing a bitmap lets you scale the map and place it anywhere within its tile. Placing can change the bitmap's scale, but shows the entire bitmap. The four values that specify the placement and size of the cropping or placement region are all animatable. Cropping and placement settings affect the bitmap only as it's used for this map and any instances of the map. They have no effect on the bitmap file itself. Apply Turn on to use the cropping or placements settings. 2D Maps | 5801