Extract RGB values of multiple images

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Danah Abdulghani A Aljishi 2022-12-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1874967-extract-rgb-values-of-multiple-images

评论： Image Analyst 2022-12-13

采纳的回答： Image Analyst

Hello,

I have 300 images that I would like to extract the rgb values of each image individually. How can I do that?

Thanks

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Image Analyst 2022-12-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1874967-extract-rgb-values-of-multiple-images#answer_1124417

在 MATLAB Online 中打开

Use imread to get the RGB values of each image

for k = 1 : 300
    filename = whatever
    rgbValues = imread(filename);
end

I don't know what other program has problems separating color channels, but there are a lot of things I don't know. If all you truly need to do is split the images and save the image channels independently, then I don't see why you can't do that in the loop. You'll just have to use imwrite() to write each channel to an appropriate filename and directory.

I will point out that it would be a generally bad idea to use JPG as the output file format. Use PNG if data integrity is of any concern.

Image Analyst 2022-12-13

在 MATLAB Online 中打开

Then you'll need to use imwrite instead of stuffing them all into a cell array, which your other program won't understand.

myFolder = '......./Pictures/Fine - 1';
filePattern = fullfile(myFolder, '*.jpg'); 
theFiles = dir(filePattern);
n = length(theFiles);
R = cell(n,1);
G = cell(n,1);
B = cell(n,1);
for k = 1 : n
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(myFolder, baseFileName);
    rgbImage = imread(fullFileName);
    [r, g, b] = imsplit(rgbImage);
    % Get file parts
    [folder, baseFileNameNoExt, ext] = fileparts(fullFileName);
    % Save images to disk for the other program that needs them.
    % Save red channel.
    outputBaseFileName = sprintf('%s_R.png', baseFileNameNoExt);
    outputFullFileName = fullfile(folder, outputBaseFileName);
    imwrite(r, outputFullFileName);
    % Save green channel.
    outputBaseFileName = sprintf('%s_G.png', baseFileNameNoExt);
    outputFullFileName = fullfile(folder, outputBaseFileName);
    imwrite(g, outputFullFileName);
    % Save blue channel.
    outputBaseFileName = sprintf('%s_R.png', baseFileNameNoExt);
    outputFullFileName = fullfile(folder, outputBaseFileName);
    imwrite(b, outputFullFileName);
end