imwrite() with PGM option actually write in PBM

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Francesco Clerici
Francesco Clerici 2018-11-24
编辑： KALYAN ACHARJYA 2018-11-24
Hi all, I am trying to convert DICOM images in PGM images for a software I am using. dicomread() reads them correctly, but when it comes to use imwrite(), it provides PBM images (I check it using Mac infos, and using the fact that on the program I am writing gives me an error when I use those images, a wrong-extension-error). Note that if I try other formats like png it works.
The code is the following:
clear all; close all; clc;
MM = 1686; % maximum value for normalization
mm = -2048; % minimum value
for ii=1:331
str = strcat('/my/path/IM-0001-',num,'-0001.dcm'); % DICOM image name
info = dicominfo(str,'UseDictionaryVR',true); % DICOM info
Y = double(dicomread(info)); % read
Y = (Y-mm)./(MM-mm); % normalize
titleSlice = strcat('/my/path/slice',num2str(ii),'.pgm'); % output name
imwrite(Y,titleSlice,'pgm'); % imwrite() which provides PBM and not PGM
end

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2018-11-24
编辑：KALYAN ACHARJYA 2018-11-24
Follow this way, its works to write the dicom in pgm format
path_directory='dcm_sample_images'; % 'Folder name'
original_files=dir([path_directory '/*.dcm']);
for j=1:3
filename=[path_directory '/' original_files(j).name];
I1=double(dicomread(filename));
%do your findings, say I2 is results
path_folder='D:\JNU jaipur\PhD\Matlab Work\dicom_write_test';
baseFileName=sprintf('%d.pgm',j);
fullFileName=fullfile(path_folder,baseFileName); % No need to worry about slashes now!
imwrite(I2,fullFileName);
end
222.png
111.png

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