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

11 次查看（过去 30 天）

priyanka 2014-3-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123617-rgb-images-are-3-d-i-e-3-2-d-array-for-r-g-b-can-we-extract-these-array-seperatly

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??

采纳的回答

Wayne King 2014-3-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123617-rgb-images-are-3-d-i-e-3-2-d-array-for-r-g-b-can-we-extract-these-array-seperatly#answer_131194

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);

4 个评论
显示 2更早的评论隐藏 2更早的评论

priyanka 2014-3-29

Thank you,, its working .:)

MAHMOOD QADIR 2021-3-27

Thank you very much

请先登录，再进行评论。

更多回答（2 个）

Image Analyst 2014-3-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123617-rgb-images-are-3-d-i-e-3-2-d-array-for-r-g-b-can-we-extract-these-array-seperatly#answer_131266

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.

请先登录，再进行评论。

priyanka 2014-3-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123617-rgb-images-are-3-d-i-e-3-2-d-array-for-r-g-b-can-we-extract-these-array-seperatly#answer_131273

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);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

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);

请先登录，再进行评论。

请先登录，再回答此问题。