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matlabuint

Incorrect result from a multiplication of Integer

I read a DICOM image and I extracted some of its characteristics such as width and height. Now I want to save in a variable the number of total pixels of the image. This is the code:

info = dicominfo(filename);

width = info.Width;
height = info.Height;
colorType = info.ColorType;
format = info.Format;
size = info.FileSize;
numberOfPixels = width*height;
k = info.BitDepth;

And these are the prints:

  Size: 256 x 256
  Color type: grayscale
  Format: DICOM
  Size: 137024 bytes
  NumberOfPixels: 65535

The numberOfPixels value is wrong. Why?

I thought it was a cast problem and so I also tried adding uint32(width*height) but nothing, I get 65535 instead of 65536. Why?

Thank you

Solution

  • You should cast before multiplying e.g. uint32(width)*uint32(height).