MATLAB: How do i change the image

From 3D(JPEG) to 2D

Do i change it to grayscale? how do i do so .

??? Error using ==> iptcheckinput Function IMHIST expected its first input, I or X, to be two-dimensional.

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Have a look at rgb2gray. Alternatively, consider applying imhist to the separate colour planes.

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MATLAB: Changing pictures

Define "automatically." Do you mean in a for loop? See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F so you'll know how to do stuff like this:

filePattern = fullfile(myFolder, '*.jpg');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
  baseFileName = jpegFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName);
  imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
    promptMessage = sprintf('Do you want to Continue or Cancel?');
    button = questdlg(promptMessage, 'Continue', 'Continue', 'Cancel', 'Continue');
    if strcmpi(button, 'Cancel')
    break;
    end
end

MATLAB: Changing width of imhist bins

The second argument is the number of bins, which essentially means the bin width.

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MATLAB: Changing pictures

MATLAB: Changing width of imhist bins

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