Re: Anyone care to comment?
Re: Anyone care to comment?
- Subject: Re: Anyone care to comment?
- From: neil_snape <email@hidden>
- Date: Wed, 22 Sep 2004 17:32:04 +0200
on 22/09/2004 15:34, Andrew Rodney wrote :
>
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).
I think at one point Chris Cox added that Photoshop works at 21 bits either
here or on the Adobe forums. This has nothing to do with the actual bit
depth of the image data but application level processing FWIW.
Neil Snape email@hidden
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