I am trying to display an image which is stored in floating point format. I've set all of the pixel values to 255, so I expect the image to be white. However, when it is displayed, it is just a black image. Why?
Grayscale images are displayed in most cases with a 256 gray-scale palette. Because the range for a floating point number is infinite, the image is dynamically adjusted to fit in the 256 possible levels.
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