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The 180 degree image was left as-is because the
Orientation was set to "Normal".
The script needs to check for null values. Maybe something
like this...
...
my $rotation = $exifTool->GetValue('Orientation', 'ValueConv');
unless (defined $rotation and defined $rot_args{$rotation}) {
print "Nothing to do\n";
exit 0;
}
my $command = "jpegtran -copy all $rot_args{$rotation} IMG_7885.JPG > IMG_7885_2.JPG";
...
You don't rotation an image if the Orientation is "Normal", so
you should do nothing if the value is 1. If your camera uses
this value when the image is rotated by 180 degrees, it is because
the camera doesn't know when it is upside down.
- Phil
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