How can I generate an image from a matrix?

Question

Cesar 2013-2-2

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The image would be 3 x 3 with the colors as shown below. The other can stay white.

 Red    Yellow
   Green  
 Green    Blue

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Jan 2013-2-2

Deleted questions are annoying.

Randy Souza 2013-2-12

I have restored the original text of this question.

Cesar, this question has a clear subject and an accepted answer, so it may be valuable to someone else in the future. If you have a good reason why it should be removed from MATLAB Answers, please flag the question, explain why it should be deleted, and an administrator or high-reputation contributor will consider deleting the question. Please do not simply edit your question away.

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Answer 1

Walter Roberson 2013-2-2

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编辑：Walter Roberson 2013-2-2

在 MATLAB Online 中打开

Red = [255 0 0];
Yellow = [0 255 255];
Green = [0 0 255];
Blue = [0 255 0];
Im = uint8(255) * ones(3,3,3,'uint8');
Im(1,1,:) = Red;
Im(1,3,:) = Yellow;

and so on.

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Cesar 2013-2-2

编辑：Walter Roberson 2013-2-2

在 MATLAB Online 中打开

Did not work. I continue on as shown below. The image is extremely small and the colors did not come out right. See below:

EDU>> Red = [255 0 0];
EDU>> Yellow = [0 255 255];
EDU>> Green = [0 0 255];
EDU>> Blue = [0 255 0];
EDU>> Im = uint8(255) * ones(3,3,3,'uint8');
EDU>> Im(1,1,:) = Red;
EDU>> Im(1,3,:) = Yellow;
EDU>> Im(2,2,:) = Green;
EDU>> Im(1,3,:) = Green;
EDU>> Im(3,3,:) = Blue;
EDU>> figure, imshow(Im)
EDU>> imshow(Im)
EDU>> figure, imshow(Im)

Walter Roberson 2013-2-2

Of course the image is extremely small. You asked for a 3x3 image. 3 pixels by 3 pixels.

I should have used [255 255 0] for yellow.

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Answer 2

Youssef Khmou 2013-2-2

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在 MATLAB Online 中打开

Hi, add the property 'notruesize' to imshow function :

imshow(Im,'notruesize');

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Youssef Khmou 2013-2-2

I have no idea about the 255,0 arrangement for RGB, verify that repartition you gave,

Youssef Khmou 2013-2-2

i am trying to write a function for that purpose, i think you gave wrong colors .

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Answer 3

Youssef Khmou 2013-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/61409-how-can-i-generate-an-image-from-a-matrix#answer_73515

在 MATLAB Online 中打开

Here is your solution :

 Red = [255 0 0];
Yellow = [255 255 0];
Green = [0 0 255];
Blue = [0 255 0];
Im = uint8(255) * ones(3,3,3,'uint8');
Im(1,1,:) = Red;
Im(1,3,:) = Yellow;
Im(2,2,:)=Blue;
Im(3,1,:)=Blue;
Im(3,3,:)=Green;
window=ones(100,100,'uint8');
RED=kron(Im(:,:,1),window);
GREEN=kron(Im(:,:,2),window);
BLUE=kron(Im(:,:,3),window);
FINAL=ones(300,300,3,'uint8');
FINAL(:,:,1)=RED;
FINAL(:,:,2)=GREEN;
FINAL(:,:,3)=BLUE;
figure, imshow(FINAL)