Displaying the size of a picture in cm would be a somewhat complicated conversion. Pixels are physical points which are the smallest addressable element on a display. To convert from pixel to cm you would have to know the exact size of the pixel
and exactly how many pixels there are per cm. The result would not be a constant figure because it would be different on different displays since not all displays use the exact same pixel size. And, just changing the display resolution will physically
change the size of the picture being displayed.
Perhaps a little internet research about pixels might be enlightening.
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