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Cyb has your best option in post #3 – 16 bit mode.
16 bit mode is nice if you have a 16 bit source. However most current digital cameras have 12 bit raw output, 0..4095. One can convert to true 16 bit by multiplying the 12 bit value by 16 or to the PS 15+1 mode by multiplying by 8 and adding 1 (I think).
Either way there are many gaps in the data, since the output consists of multiples of 8 or 16 with no intervening values. However, these gaps are not significant if the differences can not be detected by the eye, whose response is approximately logarithmic, detecting a luminance difference of approximately 1% in bright areas and becoming less sensitive to differences in the dim areas as predicted by the Steven’s formula:
< http://www.neuro.uu.se/fysiologi/gu/nbb/lectures/Stevens.htm l>
16 bit mode is nice if you have a 16 bit source. However most current digital cameras have 12 bit raw output, 0..4095. One can convert to true 16 bit by multiplying the 12 bit value by 16 or to the PS 15+1 mode by multiplying by 8 and adding 1 (I think).
Either way there are many gaps in the data, since the output consists of multiples of 8 or 16 with no intervening values. However, these gaps are not significant if the differences can not be detected by the eye, whose response is approximately logarithmic, detecting a luminance difference of approximately 1% in bright areas and becoming less sensitive to differences in the dim areas as predicted by the Steven’s formula:
< http://www.neuro.uu.se/fysiologi/gu/nbb/lectures/Stevens.htm l>
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