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tiff_read_header.m
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function [TiffInfo,Img]=tiff_read_header(filename)
% This function tiff_read_header can be used to read the header(s) of
% complex tiff files. It implements a part of the Tiff version 5 and 6
% specifications.
%
%
% Info = tiff_read_header( Filename )
% or
% [Info,I] = tiff_read_header( Filename )
%
% inputs,
% Filename : filename of a Tif/Tiff file
%
% ouputs,
% Info : Struct with Tiff tags, or in case of multiple images,
% cell array with struct for every image.
% I : Image Data (Only supported for non-compressed data)
%
% Note:
% SubHeaders can be found in SubIFD1,SubIFD2 ...
%
%
% Literature,
% http://www.awaresystems.be/imaging/tiff/tifftags/baseline.html
% http://www.fileformat.info/format/tiff/corion.htm
% http://www.compix.com/fileformattif.htm
% http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
%
% Written by D.Kroon 31-05-2012
%
% Create the Tiff-tag Dictionary
i=1;
Dic{i}='254,NewSubfileType'; i=i+1;
Dic{i}='255,SubfileType'; i=i+1;
Dic{i}='256,ImageWidth'; i=i+1;
Dic{i}='257,ImageHeight'; i=i+1;
Dic{i}='258,BitsPerSample'; i=i+1;
Dic{i}='259,Compression'; i=i+1;
Dic{i}='262,PhotometricInterpretation'; i=i+1;
Dic{i}='263,Treshholding'; i=i+1;
Dic{i}='264,CellWidth'; i=i+1;
Dic{i}='265,CellLength'; i=i+1;
Dic{i}='266,FillOrder'; i=i+1;
Dic{i}='269,DocumentName'; i=i+1;
Dic{i}='270,ImageDescription'; i=i+1;
Dic{i}='271,Make'; i=i+1;
Dic{i}='272,Model'; i=i+1;
Dic{i}='273,StripOffsets'; i=i+1;
Dic{i}='274,Orientation'; i=i+1;
Dic{i}='277,SamplesPerPixel'; i=i+1;
Dic{i}='278,RowsPerStrip'; i=i+1;
Dic{i}='279,StripByteCount'; i=i+1;
Dic{i}='280,MinSampleValue'; i=i+1;
Dic{i}='281,MaxSampleValue'; i=i+1;
Dic{i}='282,Xresolution'; i=i+1;
Dic{i}='283,Yresolution'; i=i+1;
Dic{i}='284,PlanarConfiguration'; i=i+1;
Dic{i}='285,PageName'; i=i+1;
Dic{i}='286,XPosition'; i=i+1;
Dic{i}='287,YPosition'; i=i+1;
Dic{i}='288,FreeOffsets'; i=i+1;
Dic{i}='289,FreeByteCounts'; i=i+1;
Dic{i}='290,GrayResponseUnit'; i=i+1;
Dic{i}='291,GrayResponseCurve'; i=i+1;
Dic{i}='292,T4Options'; i=i+1;
Dic{i}='293,T6Options'; i=i+1;
Dic{i}='296,ResolutionUnit'; i=i+1;
Dic{i}='297,PageNumber'; i=i+1;
Dic{i}='301,TransferFunction'; i=i+1;
Dic{i}='305,Software'; i=i+1;
Dic{i}='306,DateTime'; i=i+1;
Dic{i}='315,Artist'; i=i+1;
Dic{i}='316,HostComputer'; i=i+1;
Dic{i}='317,Predictor'; i=i+1;
Dic{i}='318,ColorImageType'; i=i+1;
Dic{i}='319,ColorList'; i=i+1;
Dic{i}='320,Colormap'; i=i+1;
Dic{i}='321,HalftoneHints'; i=i+1;
Dic{i}='322,TileWidth'; i=i+1;
Dic{i}='323,TileLength'; i=i+1;
Dic{i}='324,TileOffsets'; i=i+1;
Dic{i}='325,TileByteCounts'; i=i+1;
Dic{i}='326,BadFaxLines'; i=i+1;
Dic{i}='330,SubIFDs'; i=i+1;
Dic{i}='332,InkSet'; i=i+1;
Dic{i}='333,InkNames'; i=i+1;
Dic{i}='334,NumberOfInks'; i=i+1;
Dic{i}='336,DotRange'; i=i+1;
Dic{i}='337,TargetPrinter'; i=i+1;
Dic{i}='338,ExtraSamples'; i=i+1;
Dic{i}='339,SampleFormat'; i=i+1;
Dic{i}='340,SMinSampleValue'; i=i+1;
Dic{i}='341,MaxSampleValue'; i=i+1;
Dic{i}='342,TransferRange'; i=i+1;
Dic{i}='343,ClipPath'; i=i+1;
Dic{i}='33432,Copyright'; i=i+1;
% Split the Dictonary in Tag-ID and Tag-Name-list
TagId=zeros(1,length(Dic));
TagName=cell(1,length(Dic));
for j=1:length(Dic)
bytes=uint8(Dic{j});
bytes(bytes==32)=[];
n=find(bytes==44);
TagId(j)=str2double(char(bytes(1:n(1)-1)));
TagName{j}=char(bytes(n(1)+1:end));
end
% Open the File
fid = fopen(filename,'r','l');
% Get File Size
fseek(fid,0,'eof');
fs = ftell(fid);
% Get the ByteOrder
fseek(fid,0,'bof');
ByteOrder= fread(fid,2,'char=>char')';
fclose(fid);
switch(ByteOrder)
case 'II'
fid = fopen(filename,'r','l');
case 'MM'
fid = fopen(filename,'r','b');
otherwise
fid = fopen(filename,'r','l');
end
fseek(fid,2,'bof');
VersionNumber= fread(fid,1,'uint16=>uint16');
% Get Position of the first Header (image file directory)
FirstIFD = fread(fid,1,'uint32=>uint32');
npage=1;
TiffInfo=cell(1,1);
TInfo=readIFD(fid,FirstIFD,TagId,TagName);
% If SubIFDs exist then there are sub images/headers
if(isfield(TInfo,'SubIFDs'))
subIFD=TInfo.SubIFDs;
for j=1:length(subIFD)
TInfo.( ['SubIFD' num2str(j)])=readIFD(fid,subIFD(j),TagId,TagName);
end
end
TiffInfo{npage}=TInfo;
% If NextIFD is larger then zero then there are multiple images/headers
NextIFD=TiffInfo{npage}.NextIFD;
while(NextIFD~=0)
npage=npage+1;
TInfo=readIFD(fid,NextIFD,TagId,TagName);
% If SubIFDs exist then there are sub images/headers
if(isfield(TInfo,'SubIFDs'))
subIFD=TInfo.SubIFDs;
for j=1:length(subIFD)
TInfo.( ['SubIFD' num2str(j)])=readIFD(fid,subIFD(j),TagId,TagName);
end
end
TiffInfo{npage}=TInfo;
NextIFD=TiffInfo{npage}.NextIFD;
end
fclose(fid);
if(nargout>1)
% Only works for No Compression
if(TiffInfo{1}.Compression==1)
fid = fopen(filename);
% Read the Image Data
for k=1:npage
I=readImageData(fid,TiffInfo{k});
if(k==1)
Img=zeros([size(I) npage],class(I));
end
switch(ndims(I))
case 2
Img(:,:,k)=I;
case 3
Img(:,:,:,k)=I;
end
end
fclose(fid)
else
Img=[];
end
end
% If only one header, we output a struct instead of a cell
if(npage==1)
TiffInfo=TiffInfo{npage};
end
% Read one Image File Directory (Header)
function TiffInfo=readIFD(fid,PositionIFD,TagId,TagName);
% Get number of Tags
fseek(fid,double(PositionIFD),'bof');
IfdLength=fread(fid,1,'uint16=>uint16');
TiffInfo=struct();
% Read all Tags
for j=1:IfdLength
TagCode=fread(fid,1,'uint16=>uint16');
TagType=fread(fid,1,'uint16=>uint16')';
TagLength=fread(fid,1,'uint32=>uint32');
switch(TagType)
case 1 %byte
nbyte=TagLength*1;
case 2 % ASCII
nbyte=TagLength*1;
case 3 % Word
nbyte=TagLength*2;
case 4 % DWord - Uword
nbyte=TagLength*4;
case 5 % Rational (2 dwords, numerator and denominator)
nbyte=TagLength*2*4;
case 6 % 8-bit signed (twos-complement) integer.
nbyte=TagLength;
case 7 % A 8-bit byte undefined
nbyte=TagLength*1;
case 8 % 16-bit (2-byte) signed (twos-complement) integer.
nbyte=TagLength*2;
case 9 % A 32 bit(4-byte) signed (twos-complement) integer
nbyte=TagLength*4;
case 10 % Two SLONGs, numerator/denominator
nbyte=TagLength*8;
case 11 % Single precision (4-byte) IEEE format
nbyte=TagLength*4;
case 12 % Double precision (8-byte) IEEE format
nbyte=TagLength*8;
case 13 % uint32??
nbyte=TagLength*4;
otherwise
end
% If more bytes than 4, the data is stored
% elsewhere in the file
if(nbyte>4)
TagDataOffset=fread(fid,1,'uint32=>uint32');
cPos=ftell(fid);
fseek(fid,double(TagDataOffset),'bof');
end
switch(TagType)
case 1 %byte
TagValue=fread(fid,TagLength,'uint8=>uint8');
case 2 % ASCII
TagValue=fread(fid,TagLength,'uint8=>uint8')';
if(TagValue(end)==0), TagValue=TagValue(1:end-1); end
TagValue=char(TagValue);
case 3 % Word
TagValue=fread(fid,TagLength,'uint16=>uint16');
case 4 % DWord - Uword
TagValue=fread(fid,TagLength,'uint32=>uint32');
case 5 % Rational (2 dwords, numerator and denominator)
TagValue=double(fread(fid,TagLength*2,'uint32=>uint32'));
TagValue=TagValue(1:2:end)/TagValue(2:2:end);
case 6 % An 8-bit (2-byte) signed (twos-complement) integer.
TagValue=fread(fid,TagLength,'int8=>int8');
case 7 % A 8-bit byte undefined
TagValue=fread(fid,TagLength,'uint8=>uint8');
case 8 % 16-bit (2-byte) signed (twos-complement) integer.
TagValue=fread(fid,TagLength,'int16=>int16');
case 9 % A 32 bit(4-byte) signed (twos-complement) integer
TagValue=fread(fid,TagLength,'int32=>int32');
case 10 % Two SLONGs, numerator/denominator
TagValue=double(fread(fid,TagLength*2,'int32=>int32'));
TagValue=TagValue(1:2:end)/TagValue(2:2:end);
case 11 % Single precision (4-byte) IEEE format
TagValue=fread(fid,TagLength,'single=>single');
case 12 % Double precision (8-byte) IEEE format
TagValue=fread(fid,TagLength,'double=>double');
case 13
TagValue=fread(fid,TagLength,'uint32=>uint32');
otherwise
end
% If the data is less than 4 bytes it is zero padded
% to 4 bytes
if(nbyte<4)
cPos=ftell(fid);
fseek(fid,cPos+(4-nbyte),'bof');
end
% Go back from data position to tag positon
if(nbyte>4)
fseek(fid,cPos,'bof');
end
% Store Tag value in Struct will all tag-info
n=find(TagId==TagCode);
if(isempty(n))
TiffInfo.( ['private_' num2str(TagCode)])=TagValue;
else
TName=TagName{n(1)};
TiffInfo.(TName)=TagValue;
% PhotometricInterpretation
if(TagCode==262)
switch(TagValue)
case 0
TiffInfo.([TName 'String'])='GrayScaleWhite';
case 1
TiffInfo.([TName 'String'])='GrayScaleBlack';
case 2
TiffInfo.([TName 'String'])='RGB';
case 3
TiffInfo.([TName 'String'])='PaletteColor';
case 4
TiffInfo.([TName 'String'])='TransparencyMask';
otherwise
TiffInfo.([TName 'String'])='Unknown';
end
end
% Compression
if(TagCode==259)
switch(TagValue)
case 1
TiffInfo.([TName 'String'])='NoCompression';
case 2
TiffInfo.([TName 'String'])='Modified-Huffman-CCITT-Group3';
case 3
TiffInfo.([TName 'String'])='Facsimile-compatible-CCITT-Group3';
case 4
TiffInfo.([TName 'String'])='Facsimile-compatible-CCITT-Group4';
case 5
TiffInfo.([TName 'String'])='LWZ';
case 7
TiffInfo.([TName 'String'])='JPEG';
case 8
TiffInfo.([TName 'String'])='ZIP';
case 32773
TiffInfo.([TName 'String'])='PackBits';
otherwise
TiffInfo.([TName 'String'])='Unknown';
end
end
end
end
TiffInfo.NextIFD=fread(fid,1,'uint32=>uint32');
function Img=readImageData(fid,TiffInfo)
switch(TiffInfo.BitsPerSample(1))
case 8
nbyte=1;
type='uint8';
case 16
nbyte=2;
type='int16';
case 32
nbyte=4;
type='single';
end
if(TiffInfo.PlanarConfiguration==1)
s=double([ TiffInfo.SamplesPerPixel TiffInfo.ImageWidth TiffInfo.ImageHeight]);
else
s=double([TiffInfo.ImageWidth TiffInfo.ImageHeight TiffInfo.SamplesPerPixel]);
end
Img=zeros([prod(s),1],type);
index=0;
for i=1:length(TiffInfo.StripOffsets);
fseek(fid, TiffInfo.StripOffsets(i),'bof');
data=fread(fid, TiffInfo.StripByteCount(i)/nbyte,type);
Img((index+1):(index+length(data)))=data;
index=index+length(data);
end
Img=reshape(Img,s);
if(TiffInfo.PlanarConfiguration==1)
Img=permute(Img,[3 2 1]);
else
end