In message ,
"Roger N. Clark (change username to rnclark)"
wrote:

In my testing of photoshop on real images, I find the following
equation:

PS = int(IP/2),

Are you sure it isn't "PS = int((IP+1)/2)"?

where PS = the photoshop "16-bit" value and
IP = the 16-bit output from ImagesPlus.

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John P Sheehy