Date: Fri, 24 Aug 2012 13:05:09 +0200 From: Bernt Hansson <bah@bananmonarki.se> To: freebsd@dreamchaser.org Cc: Polytropon <freebsd@edvax.de>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: EXIF inspector Message-ID: <50375FE5.7000809@bananmonarki.se> In-Reply-To: <503664E3.8060808@dreamchaser.org> References: <5035C6E8.3050108@dreamchaser.org> <20120823163839.e2cf7432.freebsd@edvax.de> <503664E3.8060808@dreamchaser.org>
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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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