Technical Solutions

Solution:

The following features are available for the Image Processing Toolbox 4.1 (R13SP1):

* DICOMREAD and DICOMWRITE now support lossless JPEG compression
* IMREAD and IMWRITE now support lossless JPEG compression in MATLAB
* ICCREAD can now read ICC profiles that are embedded in TIFF files
* IMWRITE can now create CIELab, ICCLab, and CMYK TIFF files

If you are using a previous version, read the following:

Several changes have been made to enhance DICOM support in The Image Processing Toolbox 3.2 (R13). For patches for this version, follow these instructions:

For Windows:

1. Download the "dicom_update.exe" self-extracting file from the following location, into your root MATLAB directory (e.g., C:\MATLAB6p5):

http://www.mathworks.com/support/solutions/files/dicom/R13/dicom_update.exe

2. Execute the following MATLAB commands:
% Change directories to your root MATLAB directory
cd(matlabroot)

% Unzip the files
!dicom_update.exe
3. Now you will be prompted to "Unzip" the files. Click the "Browse..." button, and locate your root MATLAB directory in the ensuing dialog box. Then click "Unzip", and then click "Close".

4. Now execute the following MATLAB commands to clean up:
% Delete the ZIP-file
delete dicom_update.exe

% Rehash your toolbox path cache since you have modified files in your toolbox directories
rehash toolboxcache
Alternatively, instead of running the EXE-file, you can download the ZIP-file and extract the files manually to the appropriate folders:

http://www.mathworks.com/support/solutions/files/dicom/R13/dicom_update.zip


For UNIX, Linux, and Mac:

1. Download the "dicom_update.tar" file from the following location, into your root MATLAB directory (e.g., /matlab6p5/):

http://www.mathworks.com/support/solutions/files/dicom/R13/dicom_update.tar

2. Execute the following MATLAB commands:
% Change directories to your root MATLAB directory
cd(matlabroot)

% Unzip the files
!tar -xvpf dicom_update.tar
3. Now execute the following MATLAB commands to clean up:
% Delete the TAR-file
delete dicom_update.tar

% Rehash your toolbox path cache since you have modified files in your toolbox directories
rehash toolboxcache
This patch will allow DICOMREAD to support lossless and lossy JPEG compression formats for bit depths between 8- and 16-bits. In order to utilize this new support, you will have to follow the instructions in the Related Solution listed below.