RGB images are 3-D(i.e 3 , 2-D array for R,G,B ), can we extract these array seperatly?

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priyanka 2014-3-29

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评论： Jeykishan 2022-10-16

I want to convert the 3-D image array into 1-D array, so if i got R,G & B array seperatly then these can be converted into 2-D array easily.. so how to get these 3 (R,G,B) array??

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Wayne King 2014-3-29

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编辑：Wayne King 2014-3-29

在 MATLAB Online 中打开

You just select each "page" of the matrix.

im = imread('ngc6543a.jpg');
Rim = im(:,:,1);
Gim = im(:,:,2);
Bim = im(:,:,3);

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priyanka 2014-3-29

Thank you,, its working .:)

MAHMOOD QADIR 2021-3-27

Thank you very much

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Image Analyst 2014-3-29

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在 MATLAB Online 中打开

RGB_Histogram_Demo.m

Extract each color channel

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

as shown in my attached demo that takes RGB histograms of every image in your folder.

Screenshot:

That doesn't look right. If the image is 980 by 1280 by 4 color channels, and you've read in all the data, then your reshape would not work since your new desired size does not contain all the pixels. I suggest you start your own discussion thread (rather than keep bugging priyanka), and read this and attach your actual image.

Jeykishan 2022-10-16

Thank you for the code. Very informative and usefl for me.

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priyanka 2014-3-29

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When i am using imtool() function and checking the pixel information,pixel value is not matched with the pixel value which is obtained by redChannel = rgbImage(:, :, 1); greenChannel = rgbImage(:, :, 2); blueChannel = rgbImage(:, :, 3);

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Image Analyst 2021-3-27

Attach your image. There's a good possibility you're cheking the value using the x,y from the cursor in imtool as redChannel(x,y), which would be incorrect. Remember y is row, not x, so it needs to be redChannel(y, x), NOT redChannel(x, y);

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