{"id":296,"date":"2009-10-20T13:15:38","date_gmt":"2009-10-20T17:15:38","guid":{"rendered":"https:\/\/blogs.mathworks.com\/steve\/2009\/10\/20\/embedding-an-icc-profile-into-a-tiff-file\/"},"modified":"2019-10-29T08:01:53","modified_gmt":"2019-10-29T12:01:53","slug":"embedding-an-icc-profile-into-a-tiff-file","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/steve\/2009\/10\/20\/embedding-an-icc-profile-into-a-tiff-file\/","title":{"rendered":"Embedding an ICC profile into a TIFF file"},"content":{"rendered":"
\r\n

The R2009b release of MATLAB contains a new Tiff class<\/a>. The primary purpose of this class is to provide lower-level access to creating and modifying image data and metadata in\r\n an existing TIFF file.\r\n <\/p>\r\n

Several customers have asked for the ability to embed an ICC profile into a TIFF file. The Image Processing Toolbox function\r\n iccread<\/tt><\/a> can read a profile embedded in a TIFF file, but iccwrite<\/tt><\/a> can only write a stand-alone profile file.\r\n <\/p>\r\n

Here is code using the new Tiff class to embed a profile in an existing TIFF file. Let's start by rewriting one of the Image\r\n Processing Toolbox sample PNG image files as a TIFF file.\r\n <\/p>

rgb = imread('peppers.png'<\/span>);\r\nimwrite(rgb, 'peppers.tif'<\/span>);\r\ns = dir('peppers.tif'<\/span>)<\/pre>
\r\ns = \r\n\r\n       name: 'peppers.tif'\r\n       date: '20-Oct-2009 09:14:29'\r\n      bytes: 593880\r\n      isdir: 0\r\n    datenum: 7.3407e+005\r\n\r\n<\/pre>
Now let's embed the sample profile sRGB.icm into the TIFF file we just made.<\/p>\r\n   
Step 1. Read in the raw bytes of the profile file.<\/p>
fid = fopen('sRGB.icm'<\/span>);\r\nraw_profile_bytes = fread(fid, Inf, 'uint8=>uint8'<\/span>);\r\nfclose(fid);<\/pre>
Step 2. Initialize a Tiff object using 'r+' mode (read and modify).<\/p>
tif = Tiff('peppers.tif'<\/span>, 'r+'<\/span>)<\/pre>
\r\ntif = \r\n\r\n                  TIFF File: 'peppers.tif'\r\n                       Mode: 'r+'\r\n    Current Image Directory: 1\r\n           Number Of Strips: 77\r\n                SubFileType: Tiff.SubFileType.Default\r\n                Photometric: Tiff.Photometric.RGB\r\n                ImageLength: 384\r\n                 ImageWidth: 512\r\n               RowsPerStrip: 5\r\n              BitsPerSample: 8\r\n                Compression: Tiff.Compression.PackBits\r\n               SampleFormat: Tiff.SampleFormat.UInt\r\n            SamplesPerPixel: 3\r\n        PlanarConfiguration: Tiff.PlanarConfiguration.Chunky\r\n                Orientation: Tiff.Orientation.TopLeft\r\n\r\n<\/pre>
Step 3. Embed the profile bytes as a TIFF tag.<\/p>
tif.setTag('ICCProfile'<\/span>, raw_profile_bytes);<\/pre>
Step 4. Tell the Tiff object to update the image metadata in the file.<\/p>
tif.rewriteDirectory();<\/pre>
Step 5. Close the Tiff object.<\/p>
tif.close();<\/pre>
Now the TIFF file contains the profile. Notice the file size has changed.<\/p>
s = dir('peppers.tif'<\/span>)<\/pre>
\r\ns = \r\n\r\n       name: 'peppers.tif'\r\n       date: '20-Oct-2009 09:14:30'\r\n      bytes: 597828\r\n      isdir: 0\r\n    datenum: 7.3407e+005\r\n\r\n<\/pre>
And we can read in the profile using iccread<\/tt>.\r\n   <\/p>
p = iccread('peppers.tif'<\/span>)<\/pre>
\r\np = \r\n\r\n               Header: [1x1 struct]\r\n             TagTable: {17x3 cell}\r\n            Copyright: 'Copyright (c) 1999 Hewlett-Packard Company'\r\n          Description: [1x1 struct]\r\n      MediaWhitePoint: [0.9505 1 1.0891]\r\n      MediaBlackPoint: [0 0 0]\r\n        DeviceMfgDesc: [1x1 struct]\r\n      DeviceModelDesc: [1x1 struct]\r\n      ViewingCondDesc: [1x1 struct]\r\n    ViewingConditions: [1x1 struct]\r\n            Luminance: [76.0365 80 87.1246]\r\n          Measurement: [1x1 struct]\r\n           Technology: 'Cathode Ray Tube Display'\r\n               MatTRC: [1x1 struct]\r\n          PrivateTags: {}\r\n             Filename: 'peppers.tif'\r\n\r\n<\/pre>
It would be logical to enhance iccwrite<\/tt> to make this easier for you. We'll look into that, although I'm not sure when that might happen.\r\n   <\/p>