Marco,
Yup - the arithmetic is correct, but I wonder about implementation. On the face of it you're right - why can't they just change, for example the curves dialog, from 256 discrete increments to a great many more? The fact they haven't done it yet suggests one of two things: there hasn't been much demand for it (a situation we can change), or it's a bit more involved under the hood than it seems on the surface. Worth exploring with Adobe.
Cheers,
Mark
----- Original Message -----
From: Marco Ugolini
To: Mark Segal ; ColorSync Users Mailing List
Sent: Wednesday, December 12, 2007 12:55 AM
Subject: Re: notches on the L*axis
<<Each level of a 0-255 8-bit scale corresponds to 128 levels in 15 bits:
32,768 / 256 = 128
So a 15-bit level of 18,672, for example, would correspond to a value of
145.875 in 0-255 notation:
18672 / 128 = 145.875
As you can see it's a *very simple* division. I leave it to you to determine
how hard that could possibly be to implement in Photoshop... <g>
Marco Ugolin>>
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