Question
rgbImage=imread('C:\Users\KeerthiDev\Desktop\tomato_dataset\Tomato_late_blight_water_mold\late130.jpg'); %figure,imshow(rgbImage, []); rgbImage = imadjust(rgbImage,stretchlim(rgbImage),[]); rgbImage = imreducehaze(rgbImage); figure,imshow(rgbImage); grayImage = rgb2gray(rgbImage); figure,imshow(grayImage, []); hFH = imfreehand(); binaryImage = hFH.createMask(); xy = hFH.getPosition; blackMaskedImage = grayImage; blackMaskedImage(~binaryImage) = 0; maskedRgbImage = bsxfun(@times,rgbImage,cast(binaryImage, 'like',rgbImage)); figure,imshow(maskedRgbImage); after runing this code to i got the image as shown below I want to only change this black background to white color (without any other change.)
Expert Answer
John Michell
PhD Expert
Answered Aug 27, 2026
Try this code:
rgbImage = imread('image.webp');
subplot(2, 2, 1);
imshow(rgbImage);
mask = all(rgbImage == 0, 3);
% Take the largest blob
mask = bwareafilt(mask, 1);
subplot(2, 2, 2);
imshow(mask);
maskedRgbImage = rgbImage + uint8(255 * repmat(mask, [1, 1, 3]));
subplot(2, 2, 3);
imshow(maskedRgbImage);
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