Getting pixel values from an image

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Gannian Zhang
Gannian Zhang 2016-7-22
评论： Gannian Zhang 2016-7-24
Hello, I am new to Matlab and I have a question concerning getting pixel values of an image. I have a 994x994 image and want to get every pixel value in the row 497. Could you please advise what command(s) I should use? Thank you very much.
I have loaded the image in Matlab with Imtool command and there is a pixel region window in which it shows all the pixel values I need. I am wondering if I could export them in an excel file? Thanks again.
Regards

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Thorsten
Thorsten 2016-7-22
编辑：Thorsten 2016-7-22
If your image is stored in I, like from the command
I = imread('peppers.png');
the Matlab syntax to select the element in row 497, column 1 would be
x = I(497,1);
and the syntax to select all elements uses the column operator : as a shorthand for 1:end
x = I(497, :);
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Gannian Zhang
Gannian Zhang 2016-7-24
Hi Thanks so much for the explanation. I have finally solved this problem. :-)

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Azzi Abdelmalek
Azzi Abdelmalek 2016-7-22
You can use imread to import your image like this
Im=imread('YourImage.tif') % for example
row497=Im(497,:,:)
You can export your image to an excel file
xlswrite('file.xlsx',Im)
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Gannian Zhang
Gannian Zhang 2016-7-24
Hi, thanks for your reply.
The original image was a coloured one which had three channels showing different pixel values. I wanted to convert it into a grey image first before analysis.
Could you please let me know how to do that? And how can I export data from i=1 to i=997 please? Regards.
Gannian Zhang
Gannian Zhang 2016-7-24
Hi Thank you for your help. I have finally solved the problem.

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