Re: RE - Missing Exif data

2017-10-06 Thread Igor PDML-StR 


Thanks, Ken.

So, that's consistent with my vague recollection of someone mentioning 
that fact here on the list.
But the question is, with that, does DNG converter also preserve 
"makernote" field?
To answer that, you'd need to look with a software that can show you the 
"raw" content of each field separately, e.g. ExifTool that I've mentioned 
before.


Igor



 Ken Waller Thu, 05 Oct 2017 16:53:13 -0700 wrote:

My guess would be if you see, e.g. which lens was used in the 
converted file, the makernote field has been copied.



FWIW after conversion to DNG the Exif data does show lens and camera body 
by name.



Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller



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Re: RE - Missing Exif data

2017-10-05 Thread Ken Waller 
My guess would be if you see, e.g. which lens was used in the converted 
file, the makernote field has been copied.


FWIW after conversion to DNG the Exif data does show lens and camera body by 
name.


Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller

- Original Message - 
From: "Igor PDML-StR" <pdml...@komkon.org>

Subject: RE - Missing Exif data




Ken,
Yes, as I've written in response to your original message, - "Makernote" 
field needs to be understood by the software that works with the image.
Typically, good software, even if it doesn't understand that field, should 
leave those fields in EXIF intact, just carrying it over when saving a new 
or edited file. This way you can still open that file in a different 
software that understands that field (for the required camera).


I don't know how Adobe DNG converter behaves in this respect.

My guess would be if you see, e.g. which lens was used in the converted 
file, the makernote field has been copied. (But it is possible that
it gets written to yet another field in a clear-text format. -- Did 
someone mention that earlier?)



If you are interested to find out what is in the original file, and which 
information is carried over, I'd recommend using e.g. ExifTool:

https://www.scantips.com/lights/exif.html , looking at the file
before and after DNG conversion.


Igor


Ken Waller Wed, 04 Oct 2017 12:02:09 -0700 wrote:

Just got a Tim Grey Newsletter in which he explains that while using the 
Adobe DNG converter will retain the original pixel data from the original 
capture, there are some 'private' metadata from the camera that may be 
lost. That data would generally relate to unique features of a specific 
camera model which would require software from the camera manufacturer to 
fully display.



Seems to answer a question I posted awhile back about possibly missing
Exif data relating to my K3 regarding shutter state (time delay,
bracketing etc).



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Re: RE - Missing Exif data

2017-10-05 Thread John Francis 
On Thu, Oct 05, 2017 at 05:03:17PM -0400, Stanley Halpin wrote:
> My reading of the Tim Grey comment and other bits and pieces is that we who 
> start with DNG will forever lose the Pentax unique data because there is no 
> slot in the DNG package for that. 

There is a slot in the package - the "MakerNote" tag.
The DNG spec defines that tag.  The camera writes out a MakerNote tag, but the
DNG processor doesn't know anything about the contents of the tag - the only
information it uses is the amount of data included in the tag. But that's more
than enough to be able to copy the tag contents to any new file.

Even those of us who started out with PEF files, and then ran those through the
DNG converter to create DNGs, don't lose the Pentax private data.


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Re: RE - Missing Exif data

2017-10-05 Thread Stanley Halpin 
My reading of the Tim Grey comment and other bits and pieces is that we who 
start with DNG will forever lose the Pentax unique data because there is no 
slot in the DNG package for that. 
As I write that, it seems to me that it doesn’t make sense. I would think that 
any miscellaneous data would be written to a unused data field, probably never 
to be retrieved again. But it seems it should be there somewhere…

stan

> On Oct 5, 2017, at 3:33 PM, John  wrote:
> 
> What about when DNG *is* your original data?
> 
> On 10/4/2017 15:01, Ken Waller wrote:
>> Just got a Tim Grey Newsletter in which he explains that while using the 
>> Adobe DNG converter will retain the original pixel data from the original 
>> capture, there are some 'private' metadata from the camera that may be lost. 
>> That data would generally relate to unique features of a specific camera 
>> model which would require software from the camera manufacturer to fully 
>> display.
>> Seems to answer a question I posted awhile back about possibly missing
>> Exif data relating to my K3 regarding shutter state (time delay, bracketing 
>> etc).
>> Kenneth Waller
>> http://www.pentaxphotogallery.com/kennethwaller
> 
> 
> -- 
> Science - Questions we may never find answers for.
> Religion - Answers we must never question.
> 
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Re: RE - Missing Exif data

2017-10-05 Thread John 

What about when DNG *is* your original data?

On 10/4/2017 15:01, Ken Waller wrote:

Just got a Tim Grey Newsletter in which he explains that while using the Adobe 
DNG converter will retain the original pixel data from the original capture, 
there are some 'private' metadata from the camera that may be lost. That data 
would generally relate to unique features of a specific camera model which 
would require software from the camera manufacturer to fully display.

Seems to answer a question I posted awhile back about possibly missing
Exif data relating to my K3 regarding shutter state (time delay, bracketing 
etc).

Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller




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Religion - Answers we must never question.

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RE - Missing Exif data

2017-10-05 Thread Igor PDML-StR 


Ken,
Yes, as I've written in response to your original message, - "Makernote" 
field needs to be understood by the software that works with the image.
Typically, good software, even if it doesn't understand that field, 
should leave those fields in EXIF intact, just carrying it over when 
saving a new or edited file. This way you can still open that file in a 
different software that understands that field (for the required camera).


I don't know how Adobe DNG converter behaves in this respect.

My guess would be if you see, e.g. which lens was used in the converted 
file, the makernote field has been copied. (But it is possible that
it gets written to yet another field in a clear-text format. -- Did 
someone mention that earlier?)



If you are interested to find out what is in the original file, and which 
information is carried over, I'd recommend using e.g. ExifTool:

https://www.scantips.com/lights/exif.html , looking at the file
before and after DNG conversion.


Igor


Ken Waller Wed, 04 Oct 2017 12:02:09 -0700 wrote:

Just got a Tim Grey Newsletter in which he explains that while using the 
Adobe DNG converter will retain the original pixel data from the original 
capture, there are some 'private' metadata from the camera that may be 
lost. That data would generally relate to unique features of a specific 
camera model which would require software from the camera manufacturer to 
fully display.



Seems to answer a question I posted awhile back about possibly missing
Exif data relating to my K3 regarding shutter state (time delay,
bracketing etc).



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RE - Missing Exif data

2017-10-04 Thread Ken Waller 
Just got a Tim Grey Newsletter in which he explains that while using the 
Adobe DNG converter will retain the original pixel data from the original 
capture, there are some 'private' metadata from the camera that may be lost. 
That data would generally relate to unique features of a specific camera 
model which would require software from the camera manufacturer to fully 
display.


Seems to answer a question I posted awhile back about possibly missing
Exif data relating to my K3 regarding shutter state (time delay, bracketing 
etc).


Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller 



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