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 21:28:32 +0100
on 13/4/05 21:01, Marco Ugolini at email@hidden wrote:
> 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.
I already told you - because it's practical.
Photoshop has to be able to run on some old hardware that is going to be
screwed by huge numbers of 16-bit calculations.
Working with 32769 levels is a whole lot quicker than 65536 and having an
integer at the half way mark rather than a decimal also makes the maths
easier.
--
Martin Orpen
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