Re: curves and gum and Christopher James book

[Henry Rattle <henry.rattle@ntlworld.com>]

Thanks, everyone, for the reviews of the new book. I'll be ordering one when
it hits the UK on April 1st.

Meanwhile, something puzzles me.

Someone mentioned David Hatton's gum curve being in the book, sourced from
the Alternativephotography website. Out of curiosity I looked it up there,
and it looks pretty similar to my own gum curves (though along with
Christina I find that different colours give different curves, especially
yellow). 

However one thing puzzles me - there's a note alongside the curve which says
"Note from David: The curve is applied before inversion to a negative and
the image should be RGB."

Now my practice is to apply my curves to the negatives, after splitting the
RGB channels and inverting, and before colorisation - following Mark
Nelson's PDN. 

But shouldn't the curve you apply to a positive before inversion be the
inverse of a curve you apply to a negative after inversion?

Or do I understand this even less than I thought I did? David? Anyone?

Best

Henry