https://www.posetteforever.com/viewtopic.php?f=1&t=3416&p=41150#p41150
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posfan
Monday, 16 March 2009, 12:26 PM

Re: So, You're Still Using Poser 4
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While catching up with the posts here, I remembered something about Bump files in P4.

Bump files are usually very big and take a  lot of memory. But there's a trick. 

Resave the bump files as JPG files. Then create a MAT Pose with MPE using the JPG Bump file.

This way Poser 4 is able to read JPG Bump files!!

You can't apply the JPG bump file manually - Poser won't read it.

Here's a PS action ready to download to turn b/w bump files into the green P4 bump file.