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can image tiff convert to grayscale

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bozheng
bozheng 2024-4-20
编辑： Walter Roberson 2024-4-20
as title
i have pictue which file is tiff but it is flase coding about convert (Image file cannot be uploaded)
i read the image and "gray_image = rgb2gray(image)"
but it is error what i should do
thanks Ur reading and answering

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Walter Roberson
Walter Roberson 2024-4-20
编辑：Walter Roberson 2024-4-20
Ran in:
zipname = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1674421/sample.zip';
tfile = fullfile(tempdir(), 'sample.zip');
filestr = urlwrite(zipname, tfile);
filenames = unzip(filestr);
imgname = filenames{1};
info = imfinfo(imgname)
info = struct with fields:
Filename: '/users/mss.system.p5sjk/eot i.tiff' FileModDate: '20-Apr-2024 11:03:54' FileSize: 191826 Format: 'tif' FormatVersion: [] Width: 652 Height: 97 BitDepth: 32 ColorType: 'truecolor' FormatSignature: [73 73 42 0] ByteOrder: 'little-endian' NewSubFileType: 0 BitsPerSample: [8 8 8 8] Compression: 'LZW' PhotometricInterpretation: 'RGB' StripOffsets: [8 7551 15132 22767 30420 38017 45641 53249 60998 68674 76415 84188 92015 100004 107793 115624 123518 131472 139588 147599 155729 ... ] (1x25 double) SamplesPerPixel: 4 RowsPerStrip: 4 StripByteCounts: [7543 7581 7635 7653 7597 7624 7608 7749 7676 7741 7773 7827 7989 7789 7831 7894 7954 8116 8011 8130 8226 8304 8437 8541 2166] XResolution: 96 YResolution: 96 ResolutionUnit: 'Inch' Colormap: [] PlanarConfiguration: 'Chunky' TileWidth: [] TileLength: [] TileOffsets: [] TileByteCounts: [] Orientation: 1 FillOrder: 1 GrayResponseUnit: 0.0100 MaxSampleValue: [255 255 255 255] MinSampleValue: [0 0 0 0] Thresholding: 1 Offset: 191404 Predictor: 'Horizontal differencing' ExtraSamples: 2
%ExtraSamples of 2 indicates Unassociated Alpha Values
img = imread(imgname);
rgb = img(:,:,1:3) .* img(:,:,4); %take into account the alpha
gray_image = rgb2gray(rgb);
imshow(rgb); title('rgb')
imshow(gray_image); title('gray')

更多回答（1 个）

Image Analyst
Image Analyst 2024-4-20
image is a built-in function. Do not use it as the name of your variable. Zip up your image and attach the zip file with the paperclip icon.

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