Mari 4.6v4 docs:

Channel Presets Dialog

The Channel Presets dialog is described below with functions for how to access it. A list of the controls on the dialog can be found in the table below.

What It Does

Allows you to set up preferences for quickly creating channels through the Channels palette or menu. These presets include options such as the color depth size, patch size, file space, and colorspace. This gives you the opportunity to quickly set up a channel template for channel types you know are going to be created numerous times. You can also choose from a few Mari channel presets.

How to Access It

• Menubar | Channels > Channel Presets

• Right-click | in Channels Palette > Channel Presets

Channel Presets Dialog Fields

Control	Type	What it does	Opens this dialog box	Notes
Root Path	text field, dropdown, button	Specify the file path for the creation of new channel templates.	Choose Base Path dialog	The browse and scan buttons also allow you to search for the file location.
Scan	button	Scans the Root Path for any existing texture files.		After scanning the Root Path, you should always set the Size of the texture files manually. The default values Mari sets may not be correct as channels can contain many different patch sizes.
Import	dropdown	Select which patches to import if a channel is being imported for the creation of the template. Options are: All Patches.
Resize	dropdown	Select which files should be resized when patches are being imported for channel template creation. Options are: Patches to fit images or Images to fit patches.
Category	dropdown	Selects a Mari channel preset template from the list of available shaders.		3Delight Principled - Metallic - VFX, 3Delight Principled - Non-Metallic - VFX, General, Principled BRDF - Metallic - Games, Principled BRDF - Metallic - VFX, Principled BRDF - Non Metallic - Games, Principled BRDF - Non Metallic - VFX, Unreal - Metallic - Games, Unreal - Metallic - VFX, Unreal - Non-Metallic - Games, Unreal - Non-Metallic - VFX, VRayMtl - VFX
Template	dropdown	Specifies a channel template to control the format of the filenames when Mari looks for existing textures on disk.		For more information about channel templates, see Defining Custom Channel Templates, Reviewing the Custom Channel Template File Format, and Example File: DefaultTemplates.mtt.
Prefix	text field	Specifies the filename prefix for existing texture files, if applicable.
Create	checkbox	When enabled, creates a shader and connects channels to the shader on project creation.		Most presets contain enabled channels by default.
Import	checkbox	Imports existing textures into the channel after creating it. Import settings were selected from the earlier option in the dialog.
Name	information	Specifies the name of the channel to create. Mari sets a default value, but you can change this.		For example, color, specRough, dispFine, dispBroad, colorDetail, colorDetailMask.
Size	dropdown	Specifies the patch size for the new channel, from the options: 256x256, 512x512, 1024x1024, 2048x2048, 4096x4096, 8192x8192, 16384x16384, 32768x32768. Mari sets a default value, but you can change this.		Channels can be resized later from the Channels menu or palette if necessary.
Colorspace	dropdown	The colorspace in which the colors within your project are interpreted. Either select from the shipped configuration files or allow Mari to set an Automatic colorspace.
File Space	dropdown	Specifies the file space used when generating vectors. Mari sets a default but you can change this.		Normal, Vector, Vector (flipped Y), or Normal (flipped Y)
Fill	swatch	Specifies the color to fill the new channel. Click the swatch to change the color. Mari sets a default value, but you can change this.	Select Color Dialog
Depth	dropdown	Select a color depth size for the created channel template. Options are: 8bit (Byte), 16bit (Half), 32bit (Float).		Mari sets a default value, but you can change this. The color depth size for channels can also be resized later from the Channels menu or palette if necessary.
Files	text field	Specifies the filename template used to pick existing textures to import into the channel. Mari sets a default value, but you can change this, or you can use the button to open a dialog allowing you to manually pick the files.		This option is ignored if the Import checkbox is disabled.
	button	Opens a dialog box allowing you to pick the textures for Mari to import into the new channel. This corresponds to the File text field above.	Import Dialog
	icon	Indicates that Mari has not found any textures to import.		If there are textures to import, Mari displays the number of patches available.