Protected keyword not giving expected results

[tex887]

I am attempting to change the BlackLevelRepeatDim on a Tiff file but am not seeing much success .  I have found the Protected keyword and when set to 1 it leads me to believe the values are being written out but when I try and query them there is nothing there.

Any help would be awesome!

Here is the code that I am working with

Code Select Expand

use strict;
use warnings;
use Image::ExifTool qw(:Public);

my $exifTool = new Image::ExifTool;
$exifTool->SetNewValue('SubIFD:BlackLevelRepeatDim', '1 1', Protected=>1);
my $result = $exifTool->WriteInfo($ARGV[1]);
my $info = ImageInfo($ARGV[1],'SubIFD:BlackLevelRepeatDim' );

foreach (keys %$info) {
      print "$_ => $$info{$_}\n";
}


Best,
Austin

[Phil Harvey]

Hi Austin,

If $result is 1, then the file was changed.  If it is 2, then nothing changed.  This will happen if the file doesn't contain a SubIFD, since ExifTool won't create a SubIFD.

What is the value of $result?

- Phil

[tex887]

Thank you so much for your fast response!  The result is showing up as 2 but there is a SubIFD in the file . I am also not tied to Perl if there is a simpler way to do it on the command line I am open to that as well.  Thanks again for your help!

Code Select Expand

[ExifTool]      ExifToolVersion                 : 10.13
[System]        FileName                        : IMG_0107_3.tif
[System]        FileSize                        : 12 MB
[System]        FileModifyDate                  : 2016:03:30 09:25:04-06:00
[System]        FileAccessDate                  : 2016:03:30 09:25:04-06:00
[System]        FileCreateDate                  : 2016:03:30 09:14:05-06:00
[System]        FilePermissions                 : rw-rw-rw-
[File]          FileType                        : TIFF
[File]          FileTypeExtension               : tif
[File]          MIMEType                        : image/tiff
[File]          ExifByteOrder                   : Little-endian (Intel, II)
[IFD0]          ImageWidth                      : 1274
[IFD0]          ImageHeight                     : 960
[IFD0]          BitsPerSample                   : 16 16 16 16 16
[IFD0]          Compression                     : Uncompressed
[IFD0]          PhotometricInterpretation       : RGB
[IFD0]          FillOrder                       : Normal
[IFD0]          ImageDescription                : IDL TIFF file
[IFD0]          Make                            : Test
[IFD0]          Model                           : Test
[IFD0]          StripOffsets                    : (Binary data 12952 bytes, use -b option to extract)
[IFD0]          Orientation                     : Horizontal (normal)
[IFD0]          SamplesPerPixel                 : 5
[IFD0]          RowsPerStrip                    : 3
[IFD0]          StripByteCounts                 : (Binary data 7999 bytes, use -b option to extract)
[IFD0]          XResolution                     : 100
[IFD0]          YResolution                     : 100
[IFD0]          PlanarConfiguration             : Planar
[IFD0]          ResolutionUnit                  : inches
[IFD0]          Software                        : v1.5.8
[IFD0]          ModifyDate                      : 2016:03:02 16:31:58
[XMP-x]         XMPToolkit                      : Image::ExifTool 10.13
[XMP-tiff]      BitsPerSample                   : 16, 16
[XMP-tiff]      Compression                     : Uncompressed
[XMP-tiff]      ImageHeight                     : 960
[XMP-tiff]      ImageWidth                      : 1280
[XMP-tiff]      PhotometricInterpretation       : BlackIsZero
[XMP-tiff]      PlanarConfiguration             : Chunky
[XMP-tiff]      SamplesPerPixel                 : 1
[ExifIFD]       ExposureTime                    : 1/926
[ExifIFD]       FNumber                         : 2.8
[ExifIFD]       ExposureProgram                 : Program AE
[ExifIFD]       ISOSpeed                        : 100
[ExifIFD]       ExifVersion                     : 0230
[ExifIFD]       DateTimeOriginal                : 2016:03:02 16:31:58
[ExifIFD]       ComponentsConfiguration         : Y, Cb, Cr, -
[ExifIFD]       MeteringMode                    : Average
[ExifIFD]       FocalLength                     : 5.5 mm
[ExifIFD]       FlashpixVersion                 : 0100
[ExifIFD]       ColorSpace                      : Uncalibrated
[ExifIFD]       FocalPlaneXResolution           : 266.6666667
[ExifIFD]       FocalPlaneYResolution           : 266.6666667
[ExifIFD]       FocalPlaneResolutionUnit        : mm
[ExifIFD]       SerialNumber                    : 1545076
[Composite]     Aperture                        : 2.8
[Composite]     ImageSize                       : 1274x960
[Composite]     Megapixels                      : 1.2
[Composite]     ScaleFactor35efl                : 7.2
[Composite]     ShutterSpeed                    : 1/926
[Composite]     CircleOfConfusion               : 0.004 mm
[Composite]     FOV                             : 48.7 deg
[Composite]     FocalLength35efl                : 5.5 mm (35 mm equivalent: 39.8 mm)
[Composite]     HyperfocalDistance              : 2.60 m

Code Select Expand

use strict;
use warnings;
use Image::ExifTool qw(:Public);

my $exifTool = new Image::ExifTool;
$exifTool->SetNewValue('SubIFD:BlackLevelRepeatDim', '1 1', Protected=>1);
my $result = $exifTool->WriteInfo($ARGV[1]);
print $result;
my $info = ImageInfo($ARGV[1],'SubIFD:BlackLevelRepeatDim' );

foreach (keys %$info) {
      print "$_ => $$info{$_}\n";
}

[Phil Harvey]

There is no SubIFD in the output that you posted.  The only IFD's are IFD0 and ExifIFD.

From the command line it would be:  exiftool -subifd:blacklevelrepeatdim="1 1" IMG_0107_3.tif

but that will give the same result as your script.

- Phil

[tex887]

That makes sense, but I am still confused then as to what the best method is for adding the BlackLevelRepeatDim tag, and any other for that matter, to my file.  Do I first need to declare it some how?

Thanks again for your help.

-Austin

[Phil Harvey]

Hi Austin,

BlackLevelRepeatDim has a specific meaning for the interpretation of an image in a TIFF file (which is why this tag is protected by ExifTool).  It doesn't make much sense to use it for another purpose, but you could (if you really wanted) write it to any IFD you want, for example:

exiftool -ifd0:blacklevelrepeatdim="1 1" IMG_0107_3.tif

- Phil

[tex887]

That worked!!!

The reason that I am trying to edit that tag, among others, is simply because I copy / edited some remote sensing images, the software that I am using did not carry the exif tags through . I was wondering does this also work for xmp tags?  I tried the same syntax on the following tag but was not able to get it to be go.

Code Select Expand


[XMP-Camera]    BandName                        : Red


-Austin

[Phil Harvey]

Hi Austin,

A tag must be defined to be able to write it.  EXIF tags have a preferred IFD (Group column in the EXIF Tags documentation) that they are written unless otherwise specified.

XMP Tags may only be written to the group for which they are defined.

Your XMP-Camera:BrandName tag is not known to ExifTool, so to be able to write this you must create a user-defined XMP tag.  See the sample config file for examples of how to do this.

- Phil

[tex887]

Hi Phil,

I was able to get the configuration file all setup and things are running smoothly now.  Thanks for all your help!

-Austin