How to generate the following color Image: Yellow, Green, and Red

Please how to generate the following color image:Yellow, Green,and Red by defining image Matrix And Showing me the colors of the image on the screen. The outer image size is 200 x 200 pixels, center image is 150 x 150 pixels, and the innermost image size is 100 x 100 pixels.

Answer 1

[Image Analyst]

Try this:

redChannel = 255 * ones(200, 200, 'uint8');
greenChannel = 255 * ones(200, 200, 'uint8');
blueChannel = 255 * zeros(200, 200, 'uint8');
% Blacken the inner most 150x150 for red
% so that it will be only Green.
redChannel(25:174, 25:174) = 0;
% Set the inner most 100x100 for red and
% Clears the inner most 100 x 100 for green
% so that it will be only red.
redChannel(50:149, 50:149) = 255;
greenChannel(50:149, 50:149) = 0;
rgbImage = cat(3, redChannel, greenChannel, blueChannel);
imshow(rgbImage);

[BHANU SRINIVASA]

hey ,

how can we display a [mxnx3] matrix as an image

i have the matrix and im not able to display the image

[Image Analyst]

Why not? imshow() should work

imshow(yourImage);

yourImage should be either:

1. a uint8 image with integer values in the range 0-255
2. a uint16 image with integer values in the range 0-65535
3. a double image with double values in the range 0-1

If you have anything else, like an RGB image with double values in the range 0-255, you'll have to cast it to one of the above types with functions like mat2gray(), rescale(), im2double(), im2uint8, etc. For examples:

rgbImage = uint8(rgbImage);
rgbImage = mat2gray(rgbImage);
rgbImage = uint8(rescale(rgbImage, 0, 255));

Answer 2

[Bloti Teh]

redChannel = 255 * ones(200, 200, 'uint8');

greenChannel = 255 * ones(200, 200, 'uint8');

blueChannel = 255 * zeros(200, 200, 'uint8');

% Blacken the inner most 150x150 for red

% so that it will be only Green.

redChannel(25:174, 25:174) = 0;

% Set the inner most 100x100 for red and

% Clears the inner most 100 x 100 for green

% so that it will be only red.

redChannel(50:149, 50:149) = 255;

greenChannel(50:149, 50:149) = 0;

rgbImage = cat(3, redChannel, greenChannel, blueChannel);

imshow(rgbImage);

[Image Analyst]

Not sure why you're reposting my 6 years old answer.