Re: Anyone care to comment?
Re: Anyone care to comment?
- Subject: Re: Anyone care to comment?
- From: Andrew Rodney <email@hidden>
- Date: Wed, 22 Sep 2004 07:34:44 -0600
on 9/22/04 6:11 AM, Roger Breton wrote:
>
Secondly, Photoshop's own "16 bit" mode is nothing
>
more than 12 bit in disguise
Actually it's 15 bits (according to Chris Cox). The info I have follows:
Photoshop deals with images either in 1 bit, 8 bit or 16 bit space. That's
it. An image may only use values that can be represented by some other bit
quantity, but once brought into Photoshop, it gets rounded up to the
smallest value that can contain it and all values in that space are fair
game from then on. So bringing in a 12 bit file will place it in 16 bit
space and any image manipulation may well add values that require more than
12 bits to save, so the file has effectively become 16 bit. 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).
Andrew Rodney
http://digitaldog.net/
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