Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: Marco Ugolini <email@hidden>
- Date: Wed, 13 Apr 2005 13:01:29 -0700
Andrew,
Let me runs that quote by Chris Cox again:
> 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.
With all due respect for his remarkable achievements, Chris' writing here is
unclear, and I am having a bit of trouble understanding the true meaning of
the words within the somewhat tortured prose (what is the meaning of "This
requires 16 bits of data to represent is called "16 bit""? I guess a "what"
is missing between "represent" and "is." And what is "15 1" bits?).
To get back to the substance, it is obvious why Photoshop needs a 16 bit
architecture to display the 15 bits it uses in its files, but still the
question remains unanswered: why is Photoshop using 15 bits, and not 16? Why
stop at 15 and not go all the way?
I hope someone can clear that one for me. Thank you.
--------------
Marco Ugolini
Mill Valley, CA
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