Autodesk 12812-051462-9011 User Guide 3 - Page 681

TIP If you replace an existing map with the Color Correction map, the software prompts you to choose whether to keep the old map as a sub-map. If you do so, the old map is placed in this slot. Channels rollout [channel operation] Choose the initial operation to be performed on the map color channels: ■ Normal Passes the color channels unaltered to the Color rollout controls. ■ Monochrome Converts all color channels to shades of gray. ■ Invert Replaces the red, green, and blue color channels with their inverses. The inverse for each channel is calculated by subtracting the value from the maximum value: 1.0 in the case of floating-point colors, or 255 for eight-bit channels. So, for example, red changes to cyan (green + blue); green changes to magenta (red +blue); and blue changes to yellow (red + green). ■ Custom Lets you apply different settings to each channel using the remaining controls on the rollout. TIP You can use one of the preset channel operations (Normal/Monochrome/Invert) as a starting point for customization. Choose the preset, and then choose Custom. The previous settings remain active and available for changing. Red/Green/Blue/Alpha Lets you specify channel operations on a per-channel basis. Available only when Custom is the active choice. Otherwise these fields show the current setting, such as Monochrome for the RGB channels. Use the drop-down list to choose an replacement value or channel for each channel: ■ Red/Green/Blue/Alpha Replaces the channel with the channel you choose. For example, if you set Blue=Red, the blue component of each pixel takes on the current value of the red component of that pixel. ■ Red (Inverse)/Green (Inverse)/Blue (Inverse)/Alpha (Inverse) Replaces the channel with the inverse of the channel you choose. For example, if you set Blue=Red (Inverse), the blue component of each pixel takes on the inverse of the current value of the red component of that pixel. The inverse for each channel is calculated by subtracting the value from the maximum value: 1.0 in the case of floating-point colors, or 255 for eight-bit channels. So, for example, red changes to cyan (green + blue); 5936 | Chapter 19 Material Editor, Materials, and Maps