Importing pixel array in Excel and creating an image

2018 11 9
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更新时间：2018 11 10
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Hello everyone,
A MATLAB beginner here. I would like to ask a quick question. I believe this is simple for a lot of you folks. I have an image in the form of pixel array in Excel sheet. I wish to create an image from this and also be able to set a certain threshold so that the numerical values of any pixels that do not meet the threshold become zero.
I really really appreciate everyone's help in advance!

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Caglar
Caglar 2018-11-9
can you post your excel file?
Johoon Kim
Johoon Kim 2018-11-9
Sorry for the lack of detail in my original question. Please see attached. It is a 128 x 100 matrix.

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Image Analyst
Image Analyst 2018-11-9

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Try this:
data = importdata('AuL_1.csv', ',', 5);
grayImage = data.data;
subplot(2, 2, 1);
imshow(imadjust(grayImage), []);
subplot(2, 2, 2);
histogram(grayImage);
grid on;
threshold = 4;
mask = grayImage < threshold;
% Erase mask pixels.
grayImage(mask) = 0;
subplot(2, 2, 3);
imshow(imadjust(grayImage), []);

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Johoon Kim
Johoon Kim 2018-11-9
This is exactly what I needed! Thank you!
Johoon Kim
Johoon Kim 2018-11-9
Actually one more thing... Is it possible to assign a color of different shades to the white pixels depending on its intensity value? e.g. brighter yellow to pixels that originally had value of 4, a darker shade to 5, an even darker shade to 6, and so on.
Thank you so much in advance!
Image Analyst
Image Analyst 2018-11-9
编辑：Image Analyst 2018-11-9
Yes, just use ind2rgb() to create an RGB image. Or you can keep it grayscale and just use colormap() to change the way it's displayed.

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