Re: Color Conversions and Dither
Re: Color Conversions and Dither
- Subject: Re: Color Conversions and Dither
- From: "Roy Harrington" <email@hidden>
- Date: Fri, 16 May 2008 10:52:52 -0700
The Dither option in Color Settings applies to all conversions that
result in an 8bit
file. This would include 8-bit to 8-bit color profile conversions and
all conversions
of 16bit to 8bit -- i.e. explicit Mode conversions and Printing to an
8 bit driver.
The effect of the dithering is to preserve more of the 16bit data in
the 8 bit file.
While this may seem like an impossible task it in fact does this very
well because
adjacent pixels are averaged. For example consider all the 16-bit
values between 127 and 128,
without dither you'll get all the same 8bit values. But with dither
you can represent a
patch of 127.3 with 30% 127 and 70% 128, and so forth.
So if you spend the effort to use a 16bit workflow in general it's well worth
using the Dither on the way to the printer. There is no negative side effect of
multiple dithers -- it's a negative if you don't use it. I'd consider
it a mandatory
option for just about all PS work.
Roy
On Fri, May 16, 2008 at 8:48 AM, Fleisher, Ken <email@hidden> wrote:
> Graeme and Martin, thanks for you interesting observations. I don't actually
> have any problem either using dither or not using it. I was just curious if
> others simply leave this option "on" all the time and whether anyone has
> experienced any negative side effects from multiple dithers. My guess is
> that most people leave dither turned on and don't have any problems as a
> result.
>
>
> --
> Ken Fleisher
>
> Photographer
> Imaging & Visual Services
> National Gallery of Art
> Washington, D.C.
>
> Phone: (202) 712-7471
> email@hidden
>
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