MATLAB: How to change the value of many pixel in RGB image

digital image processingimageimage acquisitionimage analysisimage processingImage Processing Toolboximage segmentation

Hi I am a beginner in Matlab, I have a RGB image, and I want to change the value of some pixels in black ..

If you can help me …

Thank you in advance

attached an image

Best Answer

img = imread('image.bmp');
hsv = rgb2hsv(img);
mask = hsv(:,:,1) >= 0.1 & hsv(:,:,1) <= 0.2;
img2 = img;
img2(repmat(mask,1,1,3)) = 0;
imshow(img2)

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MATLAB: How to convert gray or indexed images to color images

That image is a 2D image, an indexed image with a color map. It's not a 3D color RGB image. You need to convert it to an RGB image if you recognize it's an indexed image. Replace your loop with this:

for k = 1:numel(bmpFiles)
  fullInputFileName = fullfile(inputFolder,bmpFiles(k).name)
  [originalImage, colorMap] = imread(fullInputFileName);
  [rows, columns, numberOfColorChannels] = size(originalImage)
  if ~isempty(colorMap) && numberOfColorChannels == 1
    % It's an indexed image with a colormap.
    % Convert it to RGB color
    originalImage = ind2rgb(originalImage, colorMap);
    [rows, columns, numberOfColorChannels] = size(originalImage)
  end
  fullOutputFileName = fullfile(outputFolder, bmpFiles(k).name);
  outputImage = imresize(originalImage, [100,50]);
  [rows columns numberOfColorChannels] = size(outputImage);
  if numberOfColorChannels == 1
    % It's monochrome, so convert to color.
    outputImage = cat(3, outputImage, outputImage, outputImage);
  end
  
  figure,imshow(outputImage);
  imwrite(outputImage, fullOutputFileName);
end

MATLAB: How to apply (dct,dct2) an image

image = imread('Image.bmp');
y = dct(image);
help dct

help dct2

in matlab will give you a better idea.

Best Answer

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MATLAB: How to convert gray or indexed images to color images

MATLAB: How to apply (dct,dct2) an image

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