From: Bob and Carla (bb333@earthlink.net)
Date: 09/21/02-10:09:32 PM Z
> I don't think that it matters
> when you make it negative...you can filp/flop that, all day long.
Ah yes...in this case it would matter when you tweak the tonality,
but if you make it perfect when it is positive and then invert it, I
don't think that it changes the histogram....I think that you can
invert all day long (pos/neg/pos/neg) without changing the
tonality......AFTER you get the tonality the way you want it.
Bob
FDanB@aol.com wrote:
>
> Mark Nelson said in his message...
>
> >This may be a dumb question, but I would be interested in knowing if people
> >are applying the adjustment curve to their Photoshop file before they invert
> >the image to a negative or after they invert the image to a negative.
> >Especially interested in Dan's response.
> >
> >I assume it would take a different curve for one workflow or the other. Any
> >reason one would be better than the other?
>
> Not dumb at all.
>
> It's generally better to apply the adjustment curve to the positive image
> rather than after inverting it to make a negative image. There are a
> couple reasons why.
>
> As you tweak your curve, it's much easier to think in "normal" positive
> terms if the image (and step tablet that you wisely included with your
> image) don't print properly. To lighten an area of the image, you raise
> that portion of the curve; to make a tone print darker, you lower that
> portion of the curve. Very logical. (Note: this is assuming you have
> Photoshop curves set up with blacks on the left and whites on the right.)
>
> If you are using one of the spectral density methods (making negatives
> with an orange/red color) like I do for platinum, it's crucial that you
> perform the steps in the right order: curve, invert and colorize. If you
> mistakenly colorized and then inverted, you'd get a bluish negative that
> would pretty much be like printing with no negative at all on a UV
> sensitive medium like platinum.
>
> In workshops I'm now giving students a CDROM that includes several inkjet
> negative templates. Using Adjustment Layer Sets, students can apply the
> curve, invert the image and colorize it...all with ONE click of the
> mouse! Very cool and easy. I don't have these templates on my site
> because they are too big to download. If I come up with a scheme to make
> them available far and wide, I'll let you know.
>
> One final nerd note: in an ideal world, it's better to apply curves to
> 16-bit images, thereby minimizing the tendency to band. The downside is
> that you can't use nifty Adjustment Layer Sets with 16-bit images.
>
> Hope this helps!
>
> Dan
>
>
> Ender100@aol.com wrote:
> >
> > This may be a dumb question, but I would be interested in knowing if people
> > are applying the adjustment curve to their Photoshop file before they invert
> > the image to a negative or after they invert the image to a negative.
> > Especially interested in Dan's response.
> >
> > I assume it would take a different curve for one workflow or the other. Any
> > reason one would be better than the other?
> >
> > Thanks!
> >
> > Mark Nelson
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