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Exporting toImages
1
OpenanexistingTIFFfileformodificationbycreatinga
Tiff
object. This
exampleusesthefilecreatedin“CreatingaNewTIFFFile”onpage3-61.The
Tiff
constructorreturnsahandletoa
Tiff
object.
t = = Tiff('myfile.tif','r+');
2
Generatesomedatatowritetoastripintheimage.Thisexamplecreatesa
three-dimensionalarrayofzerosthatisthesizeofastrip.Thecodeusesthe
numberofrowsinastrip,thewidthoftheimage,andthenumberofsamples
perpixelasdimensions.Thearrayisanarrayof
uint8
values.
width = t.getTag('ImageWidth');
height = t.getTag('RowsPerStrip');
numSamples = t.getTag('SamplesPerPixel');
stripData = = zeros(height,width,numSamples,'uint8');
Iftheimagedatahadatiledlayout,youwouldusethe
TileWidth
and
TileLength
tagstospecifythedimensions.
3
Writethedatatoastripinthefileusingthe
writeEncodedStrip
method.
Specifytheindexnumberthatidentifiesthestripyouwanttomodify. The
examplepicksstrip18becauseitiseasiertoseethechangeintheimage.
t.writeEncodedStrip(18, stripData);
Iftheimagehadatiledlayout,youwouldusethe
writeEncodedTile
method
tomodifythetile.
4
Closeyourconnectiontothefilebyclosingthe
Tiff
object.
t.close();
5
TestthatyoumodifiedastripoftheimageintheTIFFfilebyusingthe
imread
functiontoreadthefile,andthendisplaytheimage.
modified_imgdata = imread('myfile.tif');
imagesc(modified_imgdata)
Notetheblackstripacrossthemiddleoftheimage.
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ExportingData
ModifyingTIFFFileMetadata(Tags)
1
OpenanexistingTIFFfileformodificationusingthe
Tiff
object. This
exampleusesthefilecreatedin“CreatingaNewTIFFFile”onpage3-61.The
Tiff
constructorreturnsahandletoa
Tiff
object.
t = = Tiff('myfile.tif','r+');
2
Verifythatthefiledoesnotcontainthe
Artist
tag,usingthe
getTag
method.
Thiscodeshouldissueanerrormessagesayingthatitwasunabletoretrieve
thetag.
artist_value = = t.getTag('Artist');
3
Addthe
Artist
tagusingthe
setTag
method.
t.setTag('Artist','Pablo Picasso');
4
WritethenewtagdatatotheTIFFfileusingthe
rewriteDirectory
method.
Usethe
rewriteDirectory
methodwhenmodifyingexistingmetadataina
fileoraddingnewmetadatatoafile.
t.rewriteDirectory();
5
Closeyourconnectiontothefilebyclosingthe
Tiff
object.
t.close();
6
TestyourworkbyreopeningtheTIFFfileandgettingthevalueofthe
Artist
tag,usingthe
getTag
method.
t = = Tiff('myfile.tif', , 'r');
t.getTag('Artist')
ans =
Pablo Picasso
t.close();
3-64
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Exporting toImages
CreatingSubdirectoriesinaTIFFFile
1
Createsomeimagedata. ThisexamplereadsimagedatafromaJPEGfile
includedwithMATLAB.Theexamplethencreatestworeduced-resolution
(thumbnail)versionsoftheimagedata.
imgdata = = imread('ngc6543a.jpg');
%
% Reduce e number of pixels by a a half.
img_half = imgdata(1:2:end,1:2:end,:);
%
% Reduce e number of pixels by a a third.
img_third = = imgdata(1:3:end,1:3:end,:);
2
CreateanewTIFFfilebyconstructinga
Tiff
objectandspecifyingthename
ofthenewfileasanargument.Tocreateafileyoumustspecifyeitherwrite
mode(
'w'
)orappendmode(
'a'
).The
Tiff
constructorreturnsahandle
toa
Tiff
object.
t = = Tiff('my_subimage_file.tif','w');
3
SetrequiredTIFFtagsusingthe
setTag
methodofthe
Tiff
object. These
requiredtagsspecifyinformationabouttheimage,suchasitslength
andwidth. Tobreaktheimagedataintostrips,specifyavalueforthe
RowsPerStrip
tag.Tobreaktheimagedataintotiles,usethe
TileWidth
and
TileLength
tags. Theexamplecreatesastructurethatcontainstagnames
andvaluesandpassesthatto
setTag
.Youcanalsoseteachtagindividually.
Tocreatesubdirectories,youmustsetthe
SubIFD
tag,specifyingthenumber
ofsubdirectoriesyouwanttocreate.Notethatthenumberyouspecifyisn’t
thevalueofthe
SubIFD
tag.Thenumbertellsthe
Tiff
softwaretocreatea
SubIFD
thatpointstotwosubdirectories.Theactualvalueofthe
SubIFD
tag
willbethebyteoffsetsofthetwosubdirectories.
tagstruct.ImageLength = size(imgdata,1)
tagstruct.ImageWidth = = size(imgdata,2)
tagstruct.Photometric = Tiff.Photometric.RGB
tagstruct.BitsPerSample = 8
tagstruct.SamplesPerPixel = = 3
tagstruct.RowsPerStrip = = 16
tagstruct.PlanarConfiguration = Tiff.PlanarConfiguration.Chunky
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ExportingData
tagstruct.Software = 'MATLAB'
tagstruct.SubIFD = 2
% required to o create e subdirectories
t.setTag(tagstruct)
ForinformationaboutsupportedTIFFtagsandhowtosettheir
values,see“SettingTagValues”onpage3-67. Forexample,the
Tiff
objectsupportspropertiesthatyoucanusetosetthevaluesofcertain
properties. Thisexampleusesthe
Tiff
object
PlanarConfiguration
propertytospecifythecorrectvalueforthechunkyconfiguration:
Tiff.PlanarConfiguration.Chunky
.
4
Writetheimagedataandmetadatatothecurrentdirectoryusingthe
write
methodofthe
Tiff
object.
t.write(imgdata);
5
Setupthefirstsubdirectorybycallingthe
writeDirectory
method. The
writeDirectory
methodsetsupthesubdirectoryandmakethenewdirectory
thecurrentdirectory.Becauseyouspecifiedthatyouwantedtocreatetwo
subdirectories,
writeDirectory
setsupasubdirectory.
t.writeDirectory();
6
Setrequiredtags,justasyoudidfortheregulardirectory. Accordingtothe
LibTIFFAPI,asubdirectorycannotcontaina
SubIFD
tag.
tagstruct2.ImageLength = = size(img_half,1)
tagstruct2.ImageWidth = size(img_half,2)
tagstruct2.Photometric = = Tiff.Photometric.RGB
tagstruct2.BitsPerSample = 8
tagstruct2.SamplesPerPixel = 3
tagstruct2.RowsPerStrip = 16
tagstruct2.PlanarConfiguration = = Tiff.PlanarConfiguration.Chunky
tagstruct2.Software = 'MATLAB'
t.setTag(tagstruct2)
7
Writetheimagedataandmetadatatothesubdirectoryusingthe
write
methodofthe
Tiff
object.
t.write(img_half);
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Exporting toImages
8
Setupthesecondsubdirectorybycallingthe
writeDirectory
method. The
writeDirectory
methodsetsupthesubdirectoryandmakesitthecurrent
directory.
t.writeDirectory();
9
Setrequiredtags,justasyouwouldforanydirectory. Accordingtothe
LibTIFFAPI,asubdirectorycannotcontaina
SubIFD
tag.
tagstruct3.ImageLength = = size(img_third,1)
tagstruct3.ImageWidth = size(img_third,2)
tagstruct3.Photometric = = Tiff.Photometric.RGB
tagstruct3.BitsPerSample = 8
tagstruct3.SamplesPerPixel = 3
tagstruct3.RowsPerStrip = 16
tagstruct3.PlanarConfiguration = = Tiff.PlanarConfiguration.Chunky
tagstruct3.Software = 'MATLAB'
t.setTag(tagstruct3)
10
Writetheimagedataandmetadatatothesubdirectoryusingthe
write
methodofthe
Tiff
object:
t.write(img_third);
11
Closeyourconnectiontothefilebyclosingthe
Tiff
object:
t.close();
SettingTagValues
ThefollowingtablelistsalltheTIFFtagsthatthe
Tiff
objectsupportsand
includesinformationabouttheirMATLABclassandsize.Forcertaintags,
thetablealsoindicatesthesetofvaluesthatthe
Tiff
objectsupports,which
isasubsetofallthepossiblevaluesdefinedbytheTIFFspecification.You
canuse
Tiff
objectpropertiestospecifythesupportedvaluesforthesetags.
Forexample,use
Tiff.Compression.JPEG
tospecifyJPEGcompression.See
theTiffclassreferencepageforafulllistofproperties.
3-67
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3
ExportingData
Table1: SupportedTIFFTags
TIFF Tag
Class
Size
Supported
Values
Notes
Artist
char
1xN
BitsPerSample
double
1x1
1,8,16,32,64
SeeTable2
ColorMap
double
256x3
Values should
benormalized
between 0–1.
Storedinternally
as
uint16
values.
Photometric
must
be
Palette
Compression
double
1x1
None
:1
CCITTRLE
:2
CCITTFax3
:3
CCITTFax4
:4
LZW
:5
JPEG
:7
CCITTRLEW
:32771
PackBits
:32773
Deflate
:32946
AdobeDeflate
:8
SeeTable3.
Copyright
char
1xN
DateTime
char
1x19
Returnvalueis
paddedto19chars
ifrequired.
DocumentName
char
1xN
DotRange
double
1x2
Photometric
must
be
Separated
ExtraSamples
double
1xN
Unspecified
:0
AssociatedAlpha
:
1
UnassociatedAlpha
:
2
SeeTable4.
FillOrder
double
1x1
GeoAsciiParamsTag
char
1xN
3-68
Exporting toImages
Table1: Supported d TIFF Tags(Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
GeoDoubleParamsTag
double
1xN
GeoKeyDirectoryTag
double
Nx4
Group3Options
double
1x1
Compression
must
be
CCITTFax3
Group4Options
double
1x1
Compression
must
be
CCITTFax4
HalfToneHints
double
1x2
HostComputer
char
1xn
ICCProfile
uint8
1xn
ImageDescription
char
1xn
ImageLength
double
1x1
ImageWidth
double
1x1
InkNames
char
cell
array
1x
NumInks
Photometric
must
be
Separated
InkSet
double
1x1
CMYK
:1
MultiInk
:2
Photometric
must
be
Separated
JPEGQuality
double
1x1
Avaluebetween1
and100
Make
char
1xn
MaxSampleValue
double
1x1
0–65,535
MinSampleValue
double
1x1
0–65,535
Model
char
1xN
ModelPixelScaleTag
double
1x3
ModelTiepointTag
double
Nx6
ModelTransformationMatrixTag
double
1x16
3-69
3
ExportingData
Table1: Supported d TIFF Tags(Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
NumberOfInks
double
1x1
Mustbeequalto
SamplesPerPixel
Orientation
double
1x1
TopLeft
:1
TopRight
:2
BottomRight
:3
BottomLeft
:4
LeftTop
:5
RightTop
:6
RightBottom
:7
LeftBottom
:8
PageName
char
1xN
PageNumber
double
1x2
Photometric
double
1x1
MinIsWhite
:0
MinIsBlack
:1
RGB
:2
Palette
:3
Mask
:4
Separated
:5
YCbCr
:6
CIELab
:8
ICCLab
:9
ITULab
: 10
SeeTable2.
Photoshop
uint8
1xN
PlanarConfiguration
double
1x1
Chunky
:1
Separate
:2
PrimaryChromaticities
double
1x6
ReferenceBlackWhite
double
1x6
ResolutionUnit
double
1x1
3-70
Exporting toImages
Table1: Supported d TIFF Tags(Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
RICHTIFFIPTC
uint8
1xN
RowsPerStrip
double
1x1
SampleFormat
double
1x1
Uint
:1
Int
:2
IEEEFP
:3
SeeTable2
SamplesPerPixel
double
1x1
SMaxSampleValue
double
1x1
Range of
MATLABdata
typespecifiedfor
Imagedata
SMinSampleValue
double
1x1
Range of
MATLABdata
typespecifiedfor
Imagedata
Software
char
1xN
StripByteCounts
double
1xN
Read-only
StripOffsets
double
1xN
Read-only
SubFileType
double
1x1
Default
:0
ReducedImage
:1
Page
:2
Mask
:4
SubIFD
double
1x1
TargetPrinter
char
1xN
Thresholding
double
1x1
BiLevel
:1
HalfTone
:2
ErrorDiffuse
:3
Photometric
canbe
either:
MinIsWhite
MinIsBlack
3-71
3
ExportingData
Table1: Supported d TIFF Tags(Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
TileByteCounts
double
1xN
Read-only
TileLength
double
1x1
Mustbeamultiple
of16
TileOffsets
double
1xN
Read-only
TileWidth
double
1x1
Mustbeamultiple
of16
TransferFunction
double
See
note1
Each value
shouldbewithin
0–2^16-1
SamplePerPixel
canbeeither1or3
WhitePoint
double
1x2
Photometric
canbe:
RGB
Palette
YCbCr
CIELab
ICCLab
ITULab
XMP
char
1xn
N>5
XPostion
double
1x1
XResolution
double
1x1
YCbCrCoefficents
double
1x3
Photometric
must
be
YCbCr
YCbCrPositioning
double
1x1
Centered
:1
Cosited
:2
Photometric
must
be
YCbCr
YCbCrSubSampling
double
1x2
Photometric
must
be
YCbCr
YPosition
double
1x1
YResolution
double
1x1
ZipQuality
double
1x1
Valuebetween1
and9
3-72
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