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Exporting to Images
1
Open an existing TIFF file for modification by creating a
Tiff
object. This
example uses the file created in “Creating a New TIFF File” on page 5-7. The
Tiff
constructor returns a handle to a
Tiff
object.
t = Tiff('myfile.tif','r+');
2
Generate some data to write to a strip in the image. This example creates a
three-dimensional array of zeros that is the size of a strip. The code uses the
number of rows in a strip, the width of the image, and the number of samples
per pixel as dimensions. The array is an array of
uint8
values.
width = t.getTag('ImageWidth');
height = t.getTag('RowsPerStrip');
numSamples = t.getTag('SamplesPerPixel');
stripData = zeros(height,width,numSamples,'uint8');
If the image data had a tiled layout, you would use the
TileWidth
and
TileLength
tags to specify the dimensions.
3
Write the data to a strip in the file using the
writeEncodedStrip
method.
Specify the index number that identifies the strip you want to modify. The
example picks strip 18 because it is easier to see the change in the image.
t.writeEncodedStrip(18, stripData);
If the image had a tiled layout, you would use the
writeEncodedTile
method
to modify the tile.
4
Close your connection to the file by closing the
Tiff
object.
t.close();
5
Test that you modified a strip of the image in the TIFF file by using the
imread
function to read the file, and then display the image.
modified_imgdata = imread('myfile.tif');
imagesc(modified_imgdata)
Note the black strip across the middle of the image.
5-9
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5
Images
Modifying TIFF File Metadata (Tags)
1
Open an existing TIFF file for modification using the
Tiff
object. This
example uses the file created in “Creating a New TIFF File” on page 5-7. The
Tiff
constructor returns a handle to a
Tiff
object.
t = Tiff('myfile.tif','r+');
2
Verify that the file does not contain the
Artist
tag, using the
getTag
method.
This code should issue an error message saying that it was unable to retrieve
the tag.
artist_value = t.getTag('Artist');
3
Add the
Artist
tag using the
setTag
method.
t.setTag('Artist','Pablo Picasso');
4
Write the new tag data to the TIFF file using the
rewriteDirectory
method.
Use the
rewriteDirectory
method when modifying existing metadata in a
file or adding new metadata to a file.
t.rewriteDirectory();
5
Close your connection to the file by closing the
Tiff
object.
t.close();
6
Test your work by reopening the TIFF file and getting the value of the
Artist
tag, using the
getTag
method.
t = Tiff('myfile.tif', 'r');
t.getTag('Artist')
ans =
Pablo Picasso
t.close();
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Exporting to Images
Creating Subdirectories in a TIFF File
1
Create some image data. This example reads image data from a JPEG file
included with MATLAB. The example then creates two reduced-resolution
(thumbnail) versions of the image data.
imgdata = imread('ngc6543a.jpg');
%
% Reduce number of pixels by a half.
img_half = imgdata(1:2:end,1:2:end,:);
%
% Reduce number of pixels by a third.
img_third = imgdata(1:3:end,1:3:end,:);
2
Create a new TIFF file by constructing a
Tiff
object and specifying the name
of the new file as an argument. To create a file you must specify either write
mode (
'w'
)or append mode (
'a'
). The
Tiff
constructor returns a handle
to a
Tiff
object.
t = Tiff('my_subimage_file.tif','w');
3
Set required TIFF tags using the
setTag
method of the
Tiff
object. These
required tags specify information about the image, such as its length
and width. To break the image data into strips, specify a value for the
RowsPerStrip
tag. To break the image data into tiles, use the
TileWidth
and
TileLength
tags. The example creates a structure that contains tag names
and values and passes that to
setTag
.You can also set each tag individually.
To create subdirectories, you must set the
SubIFD
tag, specifying the number
of subdirectories you want to create. Note that the number you specify isn’t
the value of the
SubIFD
tag. The number tells the
Tiff
software to create a
SubIFD
that points to two subdirectories. The actual value of the
SubIFD
tag
will be the byte offsets of the two subdirectories.
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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5
Images
tagstruct.Software = 'MATLAB'
tagstruct.SubIFD = 2
% required to create subdirectories
t.setTag(tagstruct)
For information about supported TIFF tags and how to set their
values, see “Setting Tag Values” on page 5-13. For example, the
Tiff
object supports properties that you can use to set the values of certain
properties. This example uses the
Tiff
object
PlanarConfiguration
property to specify the correct value for the chunky configuration:
Tiff.PlanarConfiguration.Chunky
.
4
Write the image data and metadata to the current directory using the
write
method of the
Tiff
object.
t.write(imgdata);
5
Set up the first subdirectory by calling the
writeDirectory
method. The
writeDirectory
method sets up the subdirectory and make the new directory
the current directory. Because you specified that you wanted to create two
subdirectories,
writeDirectory
sets up a subdirectory.
t.writeDirectory();
6
Set required tags, just as you did for the regular directory. According to the
LibTIFF API, a subdirectory cannot contain a
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
Write the image data and metadata to the subdirectory using the
write
method of the
Tiff
object.
t.write(img_half);
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Exporting to Images
8
Set up the second subdirectory by calling the
writeDirectory
method. The
writeDirectory
method sets up the subdirectory and makes it the current
directory.
t.writeDirectory();
9
Set required tags, just as you would for any directory. According to the
LibTIFF API, a subdirectory cannot contain a
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
Write the image data and metadata to the subdirectory using the
write
method of the
Tiff
object:
t.write(img_third);
11
Close your connection to the file by closing the
Tiff
object:
t.close();
Setting Tag Values
The following table lists all the TIFF tags that the
Tiff
object supports and
includes information about their MATLAB class and size. For certain tags,
the table also indicates the set of values that the
Tiff
object supports, which
is a subset of all the possible values defined by the TIFF specification. You
can use
Tiff
object properties to specify the supported values for these tags.
For example, use
Tiff.Compression.JPEG
to specify JPEG compression. See
the Tiff class reference page for a full list of properties.
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5
Images
Table 1: Supported TIFF Tags
TIFF Tag
Class
Size
Supported
Values
Notes
Artist
char
1xN
BitsPerSample
double
1x1
1,8,16,32,64
See Table 2
ColorMap
double
256x3
Values should
be normalized
between 0–1.
Stored internally
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
See Table 3.
Copyright
char
1xN
DateTime
char
1x19
Return value is
paddedto19 chars
if required.
DocumentName
char
1xN
DotRange
double
1x2
Photometric
must
be
Separated
ExtraSamples
double
1xN
Unspecified
:0
AssociatedAlpha
:
1
UnassociatedAlpha
:
2
See Table 4.
FillOrder
double
1x1
GeoAsciiParamsTag
char
1xN
5-14
Exporting to Images
Table 1: Supported 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
Avalue between 1
and 100
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
5-15
5
Images
Table 1: Supported TIFF Tags (Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
NumberOfInks
double
1x1
Must be equal to
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
See Table 2.
Photoshop
uint8
1xN
PlanarConfiguration
double
1x1
Chunky
:1
Separate
:2
PrimaryChromaticities
double
1x6
ReferenceBlackWhite
double
1x6
ResolutionUnit
double
1x1
5-16
Exporting to Images
Table 1: Supported 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
See Table 2
SamplesPerPixel
double
1x1
SMaxSampleValue
double
1x1
Range of
MATLAB data
type specified for
Image data
SMinSampleValue
double
1x1
Range of
MATLAB data
type specified for
Image data
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
can be
either:
MinIsWhite
MinIsBlack
5-17
5
Images
Table 1: Supported TIFF Tags (Continued)
TIFF Tag
Class
Size
Supported
Values
Notes
TileByteCounts
double
1xN
Read-only
TileLength
double
1x1
Must bea multiple
of 16
TileOffsets
double
1xN
Read-only
TileWidth
double
1x1
Must bea multiple
of 16
TransferFunction
double
See
note1
Each value
should be within
0–2^16-1
SamplePerPixel
can be either 1 or 3
WhitePoint
double
1x2
Photometric
can be:
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
Value between 1
and 9
5-18
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