imresize is creating negative numbers from a matrix?

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Real Name 2018-6-28
回答： Walter Roberson 2018-6-28
I'm doing something like:
image = imread(img);
image = rgb2gray(image);
image = im2double(image);
image = imresize(image);
Throughout the code, except for the last line, every element in the image matrix remains > 0. So why is imresize throwing in negative numbers?

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Walter Roberson
Walter Roberson 2018-6-28
Default interpolation method is bicubic https://www.mathworks.com/help/images/ref/imresize.html#buxswkh-1-method
"Note: Bicubic interpolation can produce pixel values outside the original range."

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