How can I generate an image from a matrix?

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Cesar
Cesar 2013-2-2
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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Randy Souza
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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Walter Roberson
Walter Roberson 2013-2-2
编辑：Walter Roberson 2013-2-2
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
Cesar 2013-2-2
编辑：Walter Roberson 2013-2-2
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
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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更多回答（2 个）

Youssef Khmou
Youssef Khmou 2013-2-2
Hi, add the property 'notruesize' to imshow function :
imshow(Im,'notruesize');
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Youssef Khmou
Youssef Khmou 2013-2-2
I have no idea about the 255,0 arrangement for RGB, verify that repartition you gave,
Youssef Khmou
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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Youssef Khmou
Youssef Khmou 2013-2-2
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)
This a clever way to multiply 3x3x3 to get 300x300x3 .
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Walter Roberson
Walter Roberson 2013-2-2
A bit too much help given on a homework problem.

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