"Kenneth" <kdw### [at] gmailcom> wrote:
> (There's also a HF difference
> between images SAVED at different gamma values, for the same reason-- 1.0 being
> a linear slope, 2.2 being more of a curve.)

Uh, I'm not so sure about that now. I made a test scene a couple of weeks ago
that showed this. (Or so I thought.) Now, a newer test scene shows no
difference-- producing the same 'linear' height_field slopes no matter what
gamma the images are saved at (with either JPEG *or* PNG image files.) But then
again, I'm using my older wonky Photoshop 5 to make and save the original
images, which can't be completely trusted as far as gamma goes.  Hmm, a mystery.

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