Archived posting to the Leica Users Group, 2008/05/19

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Subject: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range
From: rgacpa at yahoo.com (Bob Adler)
Date: Mon May 19 15:03:49 2008
 
Thanks Geoff. I shouldn't have said "blinking". My M8 shows red areas as 
blown highlights.
But I understand, and I have recovered highlights, with LR and ACR, where 
the M8?indicates?clipped.
Bob
?Bob Adler
Palo Alto, CA
http://www.raflexions.com



----- Original Message ----
From: Geoff Hopkinson <hoppyman@bigpond.net.au>
To: Leica Users Group <lug@leica-users.org>
Sent: Monday, May 19, 2008 2:34:23 PM
Subject: RE: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range

Bob, I meant, don't treat the camera histogram as gospel. I don't know about
blinking, my M8 doesn't. But even when you get the Raw file open in your
converter, a clipping warning initially does not mean that it is permanently
clipped. In ACR at least it will show which channel/s is POTENTIALLY clipped
on the current default, before you adjust it.

Cheers
Geoff
http://www.pbase.com/hoppyman/e
http://gallery.leica-users.org/v/gh/

-----Original Message-----
From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org
[mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of
Bob Adler
Sent: Tuesday, 20 May 2008 01:43
To: Leica Users Group
Subject: Re: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range

Geoff,
By saying, "treat the camera preview as a broad guide" do you mean blinking
highlights represent true?RAW clipping?
Thanks,
Bob
?Bob Adler
Palo Alto, CA
http://www.raflexions.com



----- Original Message ----
From: Geoff Hopkinson <hoppyman@bigpond.net.au>
To: Leica Users Group <lug@leica-users.org>
Sent: Sunday, May 18, 2008 2:21:47 PM
Subject: RE: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range

Ahaa, I am drawing a HDR guy into my web!
The histogram in the Raw converter shows any clipping more accurately than
the preview on the camera LCD (which uses the jpg conversion). Remember that
you are editing the linear Raw information there, although the preview is
displaying the gamma corrected output. That means that adjusting the
exposure in the converter is more flexible and powerful than the same type
of adjustment to a TIFF conversion. Gazillions more than a jpg conversion.
Of course the histograms only show the tonal range represented as 256
values, not the original 1000's. You would need a screen about 3 metres wide
otherwise!
In LUGspeak - Clipped ain't always clipped. It may not always matter. But if
you want to extract the maximum tonal range, treat the camera preview as a
broad guide, expose and edit in Raw to use as much of the tonal range as you
can.

Cheers
Geoff
http://www.pbase.com/hoppyman/e
http://gallery.leica-users.org/v/gh/
-----Original Message-----
From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org
[mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of
Ken Carney
Sent: Monday, 19 May 2008 02:23
To: 'Leica Users Group'
Subject: RE: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range

> Make your exposure for the highlights without any -EV in camera. Ideally
> as
> close to clipped as you can. Keep in mind that the camera histogram is
> from
> the jpg preview, not accurate for the Raw information.

??? I don't think I knew that.? Wonderful, another calibration process
to learn - at what point does the histogram represent the raw file?? I think
HDR has some promise, but you have to be really careful to avoid a painterly
look.? For subjects that move, you are of course forced to use faux HDR,
i.e., the same raw file opened at different ev's.? It can sometimes enhance
the image with a light touch.? Photomatix has a trial copy.

Ken


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