Archived posting to the Leica Users Group, 2012/02/08

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Subject: [Leica] IMG Circularity
From: kanner at acm.org (Herbert Kanner)
Date: Wed, 8 Feb 2012 09:55:04 -0800
References: <p0624080dcb5796cce2e2@192.168.1.104> <CAAsXt4O85MweaEUc317XjeJgTSgypTJT-r4B=-XT1R91Gvox+A@mail.gmail.com> <p06240810cb57e4580f89@192.168.1.104> <CAAsXt4OtjCvqkJmEbioC0Ee+pjYKSrTq8KSFnk7rx08yDrxCbQ@mail.gmail.com>

Hi Bob,

It's pretty hard to spot much difference between "Exposure" and 
"Brightness" in LR3. If you run your cursor over the histogram, you 
will see shaded areas that are supposed to indicate the tone ranges 
that the respective four sliders cover. The one labelled "Exposure" 
covers the largest range, which seems to means that that range of the 
histogram shifts more than the other ranges when you move the slider. 
"Brightness" does seem to move the levels laterally more uniformly, 
but it isn't all that obvious, and hard to see the difference looking 
at a picture itself.

LR4 seems to have rationalized things. On the beta version, response 
to sliders is so slow that it is hard to observe effects, but the 
histogram is divided into four somewhat more equal ranges, labelled 
(not in order) Highlights, Shadows, Whites, and Blacks. The two extra 
sliders are labelled Exposure and Contrast; perhaps they are meant to 
simulate exposure changes on film and choices of different film 
contrasts. I would tend not to touch either of those; if I want to 
play with contrast, I'd go to the tone curves and probably use the 
button that enables me to put the cursor on a specific tonal value in 
the picture itself and brighten or darken all regions of the same 
value by raising or lowering that point in the curve.

I'm pretty sure I'll upgrade to LR4 when it shows up. BTW, I've never 
used Photoshop. My wife used an early PS until it stopped working on 
an upgraded Mac OS; eventually she got a late version of Elements 
that has more in it than the early PS. For anything I do, LR is 
sufficient; I have a feeling that doing much more than I could do in 
a darkroom is overkill for my tastes. The one reason I would have for 
PS would be to remove things like power lines from a picture. It can 
usually be done in LR, but gets laborious. I once was able, in LR, to 
remove two strands of barbed wire that were between me and a donkey 
and the grass behind and in front of him/her, but it took many steps.

Cheers,

Herb


>Hi Herb,
>Well you certainly know much more thank I do about lightroom! I am confused
>by many more than 3 things. And you are certainly not alone. When I took
>Charlie Cramer's printing class several years ago, he basically said that
>the brightness slider moved the whole histogram and should not be touched!
>Since then I have done just that.
>
>Did you make it to the Evans' exhibit? I hope so; it was remarkable.
>Take care and keep posting!
>Bob
>
>On Wed, Feb 8, 2012 at 12:41 AM, Herbert Kanner <kanner at acm.org> wrote:
>
>  > Bob,
>  >
>  > That's exactly what I did. I matched the white on the blanket. And on my
>  > monitor, the picture closely matches reality. Have you calibrated your
>  > monitor recently?
>  >
>  > I'm pretty knowledgeable by now about LR3. The three things which 
> confuse
>  > me are the definition of "brightness" and the effects of "radius" and
>  > "detail". Oh, there are also some mysterious secondary sliders in noise
>  > reduction, but so far, I've not seen noise on whichi they have any 
> apparent
>  > effect.
>  >
>  > Glad you like my cat. You must meet him sometime; he loves all 
> strangers.
>  >
>  > Cheers,
>  >
>  > Herb
>  >
>  >
>  >  Love your cat, Herb!
>  >> Have you tried adjusting the white balance a bit? It seems a tad warm. 
> If
>  >> you were to take the little eye dropper in the WB area of the 
> development
>  >> module, click on it to activate it and then put it on one of the 
> whitest
>  >> flowers of the blanket and click, you might get more subtle variations 
> in
>  >> the colors of the image. Maybe BW with some contrast just for the fun 
> of
>  >> it
>  >> too!
>  >> But I'll love your cat no matter what you do to her ;-)
>  >> Best,
>  >> Bob
>  >>
>  >> On Tue, Feb 7, 2012 at 7:06 PM, Herbert Kanner <kanner at acm.org> 
> wrote:
>  >>
>  >>  > The subject says it all. http://gallery.leica-users.**
>  >>  >
>  >> org/v/herbk1/Circularity.jpg.****html<http://gallery.leica-**
>  >>
>users.org/v/herbk1/**Circularity.jpg.html<http://gallery.leica-users.org/v/herbk1/Circularity.jpg.html>
>  >> >
>  >>  > --
>  >>  > Herbert Kanner
>  >>  > kanner at acm.org
>  >>  > 650-326-8204
>  >>  >
>  >>  > Question authority and the authorities will question you.
>  >>  >
>  >>  > ______________________________****_________________
>  >>  > Leica Users Group.
>  >>  > See
>  >>
>http://leica-users.org/****mailman/listinfo/lug<http://leica-users.org/**mailman/listinfo/lug>
>  >>
><http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for
>  >>
>  >> more information
>  >>  >
>  >>
>  >>
>  >>
>  >> --
>  >> Bob Adler
>  >> Palo Alto, CA
>  >> http://www.rgaphoto.com
>  >>
>  >> ______________________________**_________________
>  >> Leica Users Group.
>  >> See
>http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
> 
>
>more information
>  >>
>  >
>  > --
>  > Herbert Kanner
>  > kanner at acm.org
>  > 650-326-8204
>  >
>  > Question authority and the authorities will question you.
>  >
>  > ______________________________**_________________
>  > Leica Users Group.
>  > See
>http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
> 
>
>more information
>  >
>
>
>
>--
>Bob Adler
>Palo Alto, CA
>http://www.rgaphoto.com
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information

-- 
Herbert Kanner
kanner at acm.org
650-326-8204

Question authority and the authorities will question you.


In reply to: Message from rgacpa at gmail.com (Robert Adler) ([Leica] IMG Circularity)
Message from rgacpa at gmail.com (Robert Adler) ([Leica] IMG Circularity)