EXIF inspector

[Bernt Hansson]

2012-08-23 19:14, Gary Aitken skrev:

> On 08/23/12 08:38, Polytropon wrote:
>> On Thu, 23 Aug 2012 00:00:08 -0600, Gary Aitken wrote:
>>> For the photo folks --
>>>
>>> What do you use for inspecting EXIF data?
>>> I've tried
>>>     exif
>>>     exiftags
>>>     exifprobe
>>> and none of them show the full compliment of tags present on my oly pen-ep3.
>>> In particular, they omit most of the vendor specific stuff,
>>> and they seem to display different parts of things, but not everything.
>>
>> I've been using exiv2 (port graphics/exiv2) which fits my needs.
>> Here's an example of its output:
>>
>> 	% exiv2 cam/img_6842.jpg
>> 	File name       : cam/img_6842.jpg
>> 	File size       : 2887326 Bytes
>> 	MIME type       : image/jpeg
>> 	Image size      : 2816 x 2112
>> 	Camera make     : Canon
>> 	Camera model    : Canon PowerShot S3 IS
>> 	Image timestamp : 2011:08:19 09:14:42
>> 	Image number    : 120-6842
>> 	Exposure time   : 1/50 s
>> 	Aperture        : F2.7
>> 	Exposure bias   : 0 EV
>> 	Flash           : No, red-eye reduction
>> 	Flash bias      : 0 EV
>> 	Focal length    : 6.0 mm
>> 	Subject distance: 68
>> 	ISO speed       : 100
>> 	Exposure mode   : Easy shooting (Auto)
>> 	Metering mode   : Multi-segment
>> 	Macro mode      : Off
>> 	Image quality   : Fine
>> 	Exif Resolution : 2816 x 2112
>> 	White balance   : Auto
>> 	Thumbnail       : image/jpeg, 5981 Bytes
>> 	Copyright       :
>> 	Exif comment    :
>>
>> See "man exiv2" for details. It's a really versatile program
>> which can be excellently integrated into scripts.
>>
>> In case you need more info from a photo file, use the "strings"
>> utility provided by the system and parse its output.
>
> Thanks
> This is rather weird.
>
> I had tried exiv2 and concluded it did not report everything because on a
> windows system I had previously used PhotoME to ascertain that the image
> stabilization parameter for my camera was in a field whose tag name was
> "ImageQuality3", and exiv2 does not report anything with "uality" in it.
> However, I now see that it does report a string called "Exif.OlympusCs.ImageStabilization" of the same type with the corresponding
> value.
>
> Strings reports neither tag.
> That makes sense, since exif tags are numerically encoded and not text,
> so I don't think strings is particularly useful.
>
> Upon further investigation, it appears that the choice of string to print
> for a tag is probably a translation provided by the program, not the image file.
> A strings on /usr/local/lib/libexiv2.so.10 shows:
>    Image stabilization
>    ImageStabilization
>    Image Stabilization for the Sony DSLR-A100
>    Image stabilization data
>    Image Stabilization Data
>    ImageStabilizationData
>    Image Stabilization A100
>    ImageStabilizationA100
>    Digital Image Stabilization
> and also specific tags for different camera manufacturers, e.g.
>    Exif.OlympusCs.
> etc.
>
> bah --
>    exif doesn't report all the tags

Try exif -l filename and it will show you all exif fields and the fields 
that's in the picture.

 From man exif

-l, --list-tags
       List all known EXIF tags and IFDs.  A JPEG image  must  be  pro-
       vided, and those tags which appear in the file are shown with an
       asterisk in the corresponding position in the list.


> warren --
>    thanks, I thought I tried p5-Image-ExifTool but in looking back at my notes
> I have a thing that says "install ExifTool" and its not there so obviously I
> didn't to that.  Will check it if exiv2 doesn't work out.
>
> Gary
>
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