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Digital images generally consist of the four standard channels: red, green, blue, and alpha. Nuke allows you to create or import additional channels as masks, lighting passes, and other types of image data.
A Nuke script can include up to 1023 uniquely named channels per compositing script. For example, you can combine multiple render passes from a 3D scene - an image from the red, green, and blue channels, a depth mask (z-depth channel), a shadow pass, a specular pass, lighting passes, and multiple mattes all stored within one image sequence in your composite.
Note: When a script is saved, any channels that are not referenced in the script are discarded automatically.
When creating channels and layers, bear in mind these good practice guidelines:
• Ensure that all layers use the same channel names in the same order. This avoids complications with multilayer .exr files imported into Nuke.
• Always use proper names for channels, never just a single letter.
• Always create a custom layer for custom channels, don't add to the existing default layers.
• Never use more than four channels per layer. Nuke only has a four channel interface.
Here's a quick overview of the workflow:
|1.||Channels in Nuke are always a part of a layer. You can create new channels and layers using the new option in the channel selection dropdown menus (such as output and mask) in a node’s properties panel. For more information, see Object Material Properties.|
|2.||Using the channel selection controls you can select which channels the node is processing and outputting, or using as a mask when color correcting for instance. For more information, see Calling Channels and .|
|3.||The channels can also be linked to other channel controls through the Link menu. For more information, see Linking Channels Using the Link Menu.|
|4.||Using the Shuffle and ShuffleCopy nodes, you can rearrange your input channels and apply the result in the output. For more information, see Swapping Channels.|