histogram doesn't work for .png images?

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Lulu Firdaus
Lulu Firdaus 2020-5-7
评论： Lulu Firdaus 2020-5-8
hello everyone. I am having trouble with displaying histogram for .png image. the image is grayscale already, so I just use this code.
I=imread('38_training.png');
figure,imhist(I)
but the histogram is.. empty.
any idea why? this is the image i'm trying to show the histagram of.
thank you! please help.

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Ameer Hamza
Ameer Hamza 2020-5-7
编辑：Ameer Hamza 2020-5-7
Your image is binary. It only has white and black pixels. Therefore it only has peaks at 0 and 255. Following example show, it has nothing to do it with png file.
im = imread('pears.png');
imhist(im)

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