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??? Error using ==> imread at 363 File "c3.jpg" does not exist.
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That file does not exist. Are you using the debugger? How did you construct the filename? Did you do it like this:
baseFileName = 'c3.jpg'; % yourFolder is whatever folder c3.jpg lives in. fullFileName = fullfile(yourFolder, baseFileName); if exist(fullFileName, 'file') grayImage = imread(fullFileName); else message = sprintf('The file %s does not exist', fullFileName); uiwait(warndlg(message)); end