Archived posting to the Leica Users Group, 2003/06/17

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Subject: Re: [Leica] Ortho-chromatic film
From: Jerry Lehrer <jerryleh@pacbell.net>
Date: Tue, 17 Jun 2003 12:36:21 -0700
References: <F78DF584-A0E3-11D7-8CC9-000393802534@mac.com>

Martin

You are correct.  I cannot understand how a sophisticated,
experienced photographer could ask that question.

Jerry

Martin Howard wrote:

> Slobodan Dimitrov wrote:
>
> > Anyone know what adjustments in PS, or any other software, can be used
> > to turn an image taken with ortho film into one that simulates the
> > tonality of pan-chromatic emulsions?
>
> If I understand correctly, orthochromatic film captures less spectral
> range than does panchromatic film.  Since PS can only work with what
> you give it, short of "inventing" new pixels, I don't see how ANY
> manipulations in PS could turn orthochromatic images into panchromatic
> images, because you don't know the reflective properties of the objects
> in the scene with regard to the range of frequencies that the ortho
> hasn't captured.  While you might be able to make some educated
> guesses, and locally adjust contrast accordlingly, I doubt you'd be
> able to results which are "the same".
>
> M.
>
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In reply to: Message from Martin Howard <mvhoward@mac.com> (Re: [Leica] Ortho-chromatic film)