How to generate image matrix Red Green Blue Yellow Green

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Jjet Jumbo 2012-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/54177-how-to-generate-image-matrix-red-green-blue-yellow-green

Generate the following image by defining image matrix:

Red Green Blue Yellow Green.

B(1:100,1:100,1:100,1:00,1:3)=0;
 imshow (B)
B(1:50,1:50,1) =1;
B(51:100,51:100,2)=1;
imshow(B)

I am trying to get a 3x3 with the specified colors; Red Green Blue Yellow Green. It's not working, it gives error.

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回答（2 个）

Image Analyst 2012-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/54177-how-to-generate-image-matrix-red-green-blue-yellow-green#answer_65866

在 MATLAB Online 中打开

Is this what you're looking for:

redChannel = zeros(100, 100, 'uint8');
greenChannel = zeros(100, 100, 'uint8');
blueChannel = zeros(100, 100, 'uint8');
redChannel(1:50,:) = 255;
greenChannel(:, 1:50) = 255;
blueChannel(51:100, 51:100) = 255;
coloredImage = cat(3, redChannel, greenChannel, blueChannel);
imshow(coloredImage)

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Cesar 2013-2-2

编辑：Walter Roberson 2013-2-2

在 MATLAB Online 中打开

Can you please complete it to create the 3 X 3 image:

Red    Yellow
  Green  
Green    Blue

Image Analyst 2013-2-2

Cesar, you can see my solution and the modifications to it to do what you want should be straightforward. Just change the row and column ranges.

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Walter Roberson 2012-11-19

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B(1:100,1:100,1:100,1:00,1:3)=0 tries to define a 5 dimensional array in which the fourth dimension is empty. 1:00 is empty. Perhaps you meant 1:100 .

RGB matrices are 3 dimensional.

You may wish to use zeros() to initialize the matrix.