Before I am condemned to the stake, here are my latest results, using an 
exr depth_map (attached).

Two attached result images: SB_rockhead1a with, in the corresponding 
section:
exr "Mapping_test.exr" gamma 1.0 interpolate 2

and SB_rockhead1b with, in the corresponding section:
exr "Mapping_test.exr" gamma 3.0 interpolate 2

The latest of course is what I want. I plead innocent M'Lord.

-- 
Thomas

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Attachments:
Download 'mapping_test.exr.dat' (126 KB) Download 'sb_rockhead1a.png' (410 KB) Download 'sb_rockhead1b.png' (366 KB)

Preview of image 'sb_rockhead1a.png'

Preview of image 'sb_rockhead1b.png'