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  1. or download this
    use Image::ExifTool;
my $DPI = 300;
...
$exif->SetNewValue("ResolutionUnit","inches");
$exif->WriteInfo($FILE)
    or warn "Failed to update EXIF in $FILE";
  2. or download this
    exiftool -XResolution=300 -YResolution=300 -ResolutionUnit=inches file
+.jpg