Copy the file NormalMapFilter.8bf to the directory C:\Program Files\Adobe\Photoshop 6.0\Plug-Ins\Filters
To run the filter, select Filter->nvTools->NormalMapFilter
This is the dialog to create normal maps from height information. The height can come from the alpha or color channels.
The normals are created by using adjacent texels. You can specify how many in the "Height Generation" area.
Scale - Specifies how much to scale the height values
MinZ - Forces the "up" direction to be a minimum value
3D Preview - 3D rendered version using the normal map
Du/Dv - Use this to create EMBM maps
Alternate conversions
Biased RGB subtracts average color of image from each texel
Red - Use the red channel as height
Green - Use the green channel as height
Blue - Use the blue channel as height
Max - Use the maximum value from the R,G and B channel
Color space - Height = 1.0 - [(1.0 - r) * (1.0 - g) * (1.0 - b)]
Alpha Field - Specifies what is placed in the alpha channel after normal map generation
Select 'Using Multiple Layers' if you are are using Layers and cannot get the alpha channel to work
This is displayed if you have only three channel selected. The filter can only access what is currently selected
Under Window->Show Channels select the alpha channel if you want to create normal maps from the alpha field.