Re: Dabbling with EXIF
Re: Dabbling with EXIF
- Subject: Re: Dabbling with EXIF
- From: Roger Howard <email@hidden>
- Date: Mon, 26 Jun 2006 14:40:53 -0700
On Jun 26, 2006, at 1:40 PM, Jay Louvion wrote:
On 26.6.2006 17:41, entity "Martin Orpen" <email@hidden>
spake
thus:
On 26 Jun 2006, at 13:59, Jay Louvion wrote:
Does any one know if it is possible to retrieve EXIF infos from one
jpeg file and impose (write) them to another using AS ?
What would be the point of that? Apart from a small number of unusual
tags like "copyright" most of the information is specific to each
shot.
Did you mean that you wanted to be able to copy and set the IPTC
information?
Regards
Curiosity puts the cats life on the line, Mr. Orpen... :-)
The reason why I ask this question, is that Photoshop CS2 offers a
way of
blending photos with different exposures together using what is
called HDR
fusion. This means that shots where the highlights are perfect can be
automatically blended in with shots wich are correctly exposed and
shots
where the lowlights are just right... The problem comes from the
fact that
the CS2 function uses the camera settings of the Exif info in the
files used
to calculate the ideal image.
I would LOVE to use this technique in the creation of panoramics,
which I
often make. For the time being, I would have to do an HDR fusion on
every
one of the twelve shots I use for a full 360 panoramic. It would be
wonderful to make three or four panoramics of differents exposures
and then
export the flattened image, apply exif data to the resulting file
and do an
HDR fusion between the three (or four) flattened images and
conclude my
panoramic using the final HDR "fused" flattened image.
Jay,
I have resisted responding until now, but since it seems we do very
similar things with our images I will chime in.
I'm a panoramic photographer as well; I copy all embedded metadata --
EXIF, IPTC, XMP -- from the first shot in a panoramic set of source
files into the final stitched TIFF, since the stitching software does
not do this automatically. There are very obvious reasons to do this,
even if not everyone can imagine why! In my case I often shoot
bracketed panoramas - I stitch each exposure set, resulting in three
stitched TIFFs. Sounds like you do similar.
I use an applet I wrote that uses ExifTool from Phil Harvey -
ExifTool is a Perl-based shell script and Perl module, so I call it
from AppleScript via do shell script. I'd be happy to share this
applet with you, or just point you in the right direction and let you
script it yourself.
The only caveat is you don't actually want to copy *all* metadata -
for instance, there are explicit values for image width/height that
are stored in EXIF fields (as well as in the file format headers
themselves). Obviously you don't need to copy this info over, and if
you do it'll tend to be wrong!
ExifTool can be downloaded here:
http://www.sno.phy.queensu.ca/~phil/exiftool/
Let me know if you need more help, or just want a copy of my applet.
It accepts one or more dropped files (the files which you want to
copy metadata *into*) and then prompts to select a file that will
serve as the source for the metadata. This works fine with JPEG,
TIFF, DNG and most RAW formats as source, and basically the same set
of file formats as destination (though I've never actually edited
metadata in RAW formats).
-R
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