Predefined Configurations

From ZBrush Info

The DE ships with a number of predefined configurations. It is likely that one of these will be suitable for your needs. The name of each configuration is effectively an abbreviation for its use. The examples below illustrate this:

• D16: Exports a file containing a single 16-bit channel with the displacement information from the alpha. This and D32 and D8 are the configurations you will likely use most often–they are the “simple” ways of exporting alphas.
• PN8: Exports a file containing two channels (actually three, with one unused) with a resolution of 8 bits each. Positive displacements are in one channel, and negative displacements in the other.
• R32: Similar to D32, except the file contains three channels with two unused; the displacement information is exported in the red channel.
• D88 or Major8/Minor8 : Exports major/minor displacements in either a single file, or two separate files.
• N8: Exports a normal map as three channels of 8-bit data.

Of course, you can tweak these configurations or define new configurations as needed.