Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: Martin Orpen <email@hidden>
- Date: Wed, 13 Apr 2005 14:23:34 +0100
on 13/4/05 14:05, Andrew Rodney at email@hidden wrote:
> I saved this from a post by Chris Cox (this was in reference to CS, I assume
> it's still true in CS2):
>
> The high-bit representation in Photoshop has always been "15 1" bits
> (32767 (which is the total number of values that can be represented by 15
> bits of precision) 1). This requires 16 bits of data to represent is
> called "16 bit". It is not an arbitrary decision on how to display this
> data, it is displaying an exact representation of the exact data Photoshop
> is using, just as 0-255 is displayed for 8 bit files.
Well that's clear :-)
ISTR that using 32767 offers advantages of being 16-bit (1 bit too many for
15), some padding space for kit that might have a bit of trouble with full
16-bit calculations and the benefit of being *odd* - which doesn't sound
that useful, but it helps speed along those calculations that require an
integer at the mid point.
Regards
--
Martin Orpen
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