[HDR-photo] Re: Bracketing

[Ferrell McCollough]

Lincoln,
I haven't tried working HDR on slides but like you, I have many bracketed 
Velvia exposures. Unfortunately, I rarely bracketed more than 1.5 stops so I 
don't think they will be of much use for HDR.

I would image slide scans must be done very carefully, then thoroughly 
checked out for alignment (rotational and translation) prior to merging.

There is no problem skewing the ev spacing from the 0 mark. HDR can handle 
it. A technique for HDR when you are dealing with small bright regions is to 
spot meter. Say for example your viewfinder is mostly covering a dimly lit 
room interior but on the other side of the room is a small window that you 
don't want to blow out. Spot meter the window then spot meter a dark region 
of the room. Cover that span with a 1EV to 2EV spacing. If you decide to use 
Matrix or Zone metering the camera will most likely bracket about the dimly 
lit room and ignore the "small hot spot" which will lead to overexposure of 
the window.


Good Luck
Ferrell




----- Original Message ----- 
From: "Lincoln Michaud" <linc at zianet.com>
To: <hdr-photo at hdr-photography.com>
Sent: Monday, February 19, 2007 4:18 PM
Subject: [HDR-photo] Re: Bracketing


> Thanks Keith,
>
> It's good to see that I am not trying to do something out of the 
> ordinary.
>
> A couple questions:
>
> 1. Following the recent posts about stacking images to reduce 'noise' 
> would you think this is just as valid coming from slide scans?
>
> 2. Is registration of images more of an issue with slide scans as  opposed 
> to digital captures?
>
> 2.  Is it sometimes advisable to modify the exposure bracketing to  cover 
> more of one side of the scene?  For instance,  if you are  shooting an 
> interior shot(metered for inside) and know some outside  window light will 
> be blown out.  Can you just tag on a couple  minus  exposures?  In other 
> words,  will it confuse the HDR software to have  lopsided bracketing such 
> as:
> -4,-3, -2,-1, 0, +1,+2    ?
>
> Thanks for your feedback,
>
>                                             Lincoln
>
>
>
>
> On Feb 19, 2007, at 10:00 AM, hdr-photo-request at hdr-photography.com 
> wrote:
>
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>> Today's Topics:
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>>    1. Bracketing (Lincoln Michaud)
>>    2. Re: Bracketing (Keith Henson)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sun, 18 Feb 2007 12:48:34 -0700
>> From: Lincoln Michaud <linc at zianet.com>
>> Subject: [HDR-photo] Bracketing
>> To: HDR-photo at hdr-photography.com
>> Message-ID: <ADC9A0CA-DDB2-44C0-A8B1-5A7D895C2BB3 at zianet.com>
>> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>>
>> Hello Folks,
>>
>>
>> My name is Lincoln and this is my first post to the group.
>>
>> I have not yet gone to digital and assume that most people here shoot
>> digital.  When I viewed some of the HDR images and saw the potential
>> of the medium I decided to see if I could adapt my many bracketed
>> color slides to HDR.
>>
>> I know that color slides have less dynamic range than negative or b&w
>> film and I assume digital as well. Since I want the best exposures
>> going into HDR , How can I best decide on the correct bracketing
>> procedure for slide films in my ongoing analog photography?
>>
>> Your comments and recommendations would be much appreciated.
>>
>>
>>
>>                 Lincoln       Las Cruces, NM
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sun, 18 Feb 2007 20:04:34 -0000
>> From: "Keith Henson" <keith.henson21 at ntlworld.com>
>> Subject: Re: [HDR-photo] Bracketing
>> To: "High Dynamic Range Photography" <hdr-photo at hdr-photography.com>
>> Message-ID: <000401c75398$02b9bd90$0202a8c0 at Northscape>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=response
>>
>> It's only very recently that we stopped HDR work with slides  (velvia) 
>> and we
>> would always run off as many exposures as required at One Stop 
>> Differences.
>> We may not always have used every slide but at least we had them to 
>> dismiss.
>> ----- Original Message -----
>> From: "Lincoln Michaud" <linc at zianet.com>
>> To: <HDR-photo at hdr-photography.com>
>> Sent: Sunday, February 18, 2007 7:48 PM
>> Subject: [HDR-photo] Bracketing
>>
>>
>>> Hello Folks,
>>>
>>>
>>> My name is Lincoln and this is my first post to the group.
>>>
>>> I have not yet gone to digital and assume that most people here shoot
>>> digital.  When I viewed some of the HDR images and saw the  potential 
>>> of
>>> the medium I decided to see if I could adapt my many bracketed  color
>>> slides to HDR.
>>>
>>> I know that color slides have less dynamic range than negative or b&w
>>> film and I assume digital as well. Since I want the best  exposures 
>>> going
>>> into HDR , How can I best decide on the correct bracketing   procedure 
>>> for
>>> slide films in my ongoing analog photography?
>>>
>>> Your comments and recommendations would be much appreciated.
>>>
>>>
>>>
>>>                Lincoln       Las Cruces, NM
>>> _______________________________________________
>>> HDR-photo mailing list
>>> HDR-photo at hdr-photography.com
>>> http://www.hdr-photography.com/mailman/listinfo/hdr-photo
>>
>>
>>
>> ------------------------------
>>
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>>
>> End of HDR-photo Digest, Vol 3, Issue 19
>> ****************************************
>>
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