"The reason I say this is "not quite right" is that you can have greater than eight bits of colour information and NOT be uing HDRI. For example, using 16 bit tiffs would still be classified as non-HDRI."

That's not exactly right either. There are two ways to count bits for an image: either by the number of bits per color channel or the number of bits per pixel. 16 bit TIFF images have 16 bits of depth per color channel (obviously), and a maximum dynamic range of 65,536:1, limited by the dynamic range of the capturing device. That is widely considered HDR. Compare that to a regular 8-bit TIFF or Jpeg, which has a maximum dynamic range of only 255:1, and cannot exceed that range.
Message edited on: 01/18/2005 10:06

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