Convert matrix number into png image
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Hello i'm new on package "Image Processing Toolbox". I have a matrix of number ( http://dl.dropbox.com/u/59868217/matlab.mat) obtained by this script ( http://dl.dropbox.com/u/59868217/show_im_GR.m) I would be able to convert an image to grayscale or black and white. Possibly in png format.
How can I do ?
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Accepted Answer
Image Analyst
on 15 Apr 2012
I looked at your m-file. You get your data like this:
A = fread(fid,size,'*uint16');
img = reshape(A,width,height); %ok-->poi trasponi
Did you know you can get the 2D matrix directly like this:
img = fread(fid, [width, height], '*uint16');
% It will be a 2D array after this.
No reshaping will be necessary. Anyway, to get it into PNG format you have to save it out to disk as a PNG format image file because when it's in MATLAB it's simply an array of numbers and format doesn't really apply.
baseFileName = 'My matrix.png';
fullFileName = fullfile(folderName, baseFileName);
imwrite(img, fullFileName);
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Geppo Batt
on 15 Apr 2012
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Image Analyst
on 17 Apr 2012
I just called them to see if you had integer or floating point values and if they were in the range 0-255, 0-1, or something else. which might cause me to call mat2gray() or uint8().
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