On Mon, Feb 6, 2012 at 6:59 AM, Harry Putnam <[email protected]> wrote:
> I've been looking around, googling for a way to extract exif info from
> images. There are many tools out there. But I wanted to fiddle with
> the information in very specific ways.
>
> I hit on the perl module: Image-ExifTool (Phil Harvey) on cpan.
>
> However I am apparently badly misunderstanding the usages shown here:
> http://search.cpan.org/~exiftool/Image-ExifTool-8.77/lib/Image/ExifTool.pod
>
> (A few bits:
>
> use Image::ExifTool qw(:Public);
>
> # ---- Simple procedural usage ----
>
> # Get hash of meta information tag names/values from an image
> $info = ImageInfo('a.jpg');
>
> # ---- Object-oriented usage ----
>
> # Create a new Image::ExifTool object
> $exifTool = new Image::ExifTool;
>
> # Extract meta information from an image
> $exifTool->ExtractInfo($file, \%options);
> ------- --------- ---=--- --------- --------
>
> But my lame attempts at using this fail miserably:
>
> (with no attempt at pretty output)
> ------- 8< snip ---------- 8< snip ---------- 8<snip -------
> use strict;
> use warnings;
> use Image::ExifTool qw(:Public);
>
> # Create a new Image::ExifTool object
> my $exifTool = new Image::ExifTool;
> my $info;
> while (<>) {
> chomp;
> # Extract meta information from an image
> # $exifTool->ExtractInfo($file, \%options);
>
> $exifTool->ExtractInfo("$_");
> }
>
> print $info;
> ------- 8< snip ---------- 8< snip ---------- 8<snip -------
>
> There is not enough information in that pod page for me to understand
> how to really get at the information. No doubt my lack of skill is
> awfully evident here.
>
> Outputs a mess:
> ./myscript t1.jpg
> ,----
> | sh: 1: Syntax error: Unterminated quoted string
> | sh: 1: ������:+Y�0y�: not found
> | sh: 1: �: not found
> | sh: 1: Syntax error: EOF in backquote substitution
> |
> | [...]
> `----
>
>
>
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> http://learn.perl.org/
>
>
Hi Harry,
Never used this module before, but I seemed to have some luck using
the example provided:
use strict;
use warnings;
BEGIN { $Image::ExifTool::configFile = '' }
use Image::ExifTool;
# Create a new Image::ExifTool object
my $exifTool = new Image::ExifTool;
$exifTool->Options(Unknown => 1);
my $fileName = 'wood.jpg';
# Extract meta information from an image
my $info = $exifTool->ImageInfo($fileName);
my $group = '';
my $tag;
foreach $tag ($exifTool->GetFoundTags('Group0'))
{
if ($group ne $exifTool->GetGroup($tag))
{
$group = $exifTool->GetGroup($tag);
print "---- $group ----\n";
}
my $val = $info->{$tag};
if (ref $val eq 'SCALAR')
{
if ($$val =~ /^Binary data/)
{
$val = "($$val)";
}
else
{
my $len = length($$val);
$val = "(Binary data $len bytes)";
}
}
printf("%-32s : %s\n", $exifTool->GetDescription($tag), $val);
}
HTH, Ken
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