145 lines
4.4 KiB
Perl
145 lines
4.4 KiB
Perl
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#------------------------------------------------------------------------------
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# File: Radiance.pm
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#
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# Description: Read Radiance RGBE HDR meta information
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#
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# Revisions: 2011/12/10 - P. Harvey Created
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#
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# References: 1) http://www.graphics.cornell.edu/online/formats/rgbe/
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# 2) http://radsite.lbl.gov/radiance/refer/filefmts.pdf
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#------------------------------------------------------------------------------
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package Image::ExifTool::Radiance;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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$VERSION = '1.01';
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# Radiance tags
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%Image::ExifTool::Radiance::Main = (
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GROUPS => { 2 => 'Image' },
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NOTES => q{
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Information extracted from Radiance RGBE HDR images. Tag ID's are all
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uppercase as stored in the file, but converted to lowercase by when
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extracting to avoid conflicts with internal ExifTool variables. See
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L<http://radsite.lbl.gov/radiance/refer/filefmts.pdf> and
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L<http://www.graphics.cornell.edu/online/formats/rgbe/> for the
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specification.
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},
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_orient => {
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Name => 'Orientation',
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PrintConv => {
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'-Y +X' => 'Horizontal (normal)',
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'-Y -X' => 'Mirror horizontal',
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'+Y -X' => 'Rotate 180',
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'+Y +X' => 'Mirror vertical',
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'+X -Y' => 'Mirror horizontal and rotate 270 CW',
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'+X +Y' => 'Rotate 90 CW',
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'-X +Y' => 'Mirror horizontal and rotate 90 CW',
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'-X -Y' => 'Rotate 270 CW',
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},
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},
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_command => 'Command',
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software => 'Software',
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view => 'View',
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'format' => 'Format', # <-- this is the one that caused the conflict when uppercase
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exposure => {
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Name => 'Exposure',
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Notes => 'divide pixel values by this to get watts/steradian/meter^2',
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},
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gamma => 'Gamma',
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colorcorr => 'ColorCorrection',
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pixaspect => 'PixelAspectRatio',
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primaries => 'ColorPrimaries',
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);
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#------------------------------------------------------------------------------
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# Extract information from a Radiance HDR file
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# Inputs: 0) ExifTool object reference, 1) DirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid RGBE image
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sub ProcessHDR($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my $buff;
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local $/ = "\x0a"; # set newline character for reading
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# verify this is a valid RIFF file
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return 0 unless $raf->ReadLine($buff) and $buff =~ /^#\?(RADIANCE|RGBE)\x0a/s;
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$et->SetFileType();
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my $tagTablePtr = GetTagTable('Image::ExifTool::Radiance::Main');
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while ($raf->ReadLine($buff)) {
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chomp $buff;
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last unless length($buff) > 0 and length($buff) < 4096;
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unless ($buff =~ /^(.*)?\s*=\s*(.*)/) {
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$et->HandleTag($tagTablePtr, '_command', $buff);
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next;
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}
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# use lower-case tag names to avoid conflicts with reserved tag table entries
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my ($tag, $val) = (lc $1, $2);
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
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unless ($tagInfo) {
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my $name = $tag;
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$name =~ tr/-_a-zA-Z0-9//dc;
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next unless length($name) > 1;
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$name = ucfirst $name;
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$tagInfo = { Name => $name };
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AddTagToTable($tagTablePtr, $tag, $tagInfo);
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}
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$et->FoundTag($tagInfo, $val);
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}
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# get image dimensions
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if ($raf->ReadLine($buff) and $buff =~ /([-+][XY])\s*(\d+)\s*([-+][XY])\s*(\d+)/) {
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$et->HandleTag($tagTablePtr, '_orient', "$1 $3");
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$et->FoundTag('ImageHeight', $2);
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$et->FoundTag('ImageWidth', $4);
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}
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::Radiance - Read Radiance RGBE HDR meta information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to extract meta
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information from Radiance RGBE images. RGBE (Red Green Blue Exponent)
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images are a type of high dynamic-range image.
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=head1 AUTHOR
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Copyright 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://radsite.lbl.gov/radiance/refer/filefmts.pdf>
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=item L<http://www.graphics.cornell.edu/online/formats/rgbe/>
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=back
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=head1 SEE ALSO
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|
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L<Image::ExifTool::TagNames/Radiance Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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