Re: Color Conversions and Dither
Re: Color Conversions and Dither
- Subject: Re: Color Conversions and Dither
- From: Andrew Rodney <email@hidden>
- Date: Fri, 16 May 2008 12:26:53 -0600
- Thread-topic: Color Conversions and Dither
On 5/16/08 11:52 AM, "Roy Harrington" wrote:
> The Dither option in Color Settings applies to all conversions that
> result in an 8bit file.
Yup. Bruce Fraser discusses this on page 209 of his last edition Real World
Photoshop quite simply and effectively (as only Bruce could):
"The Use Dither feature is somehow esoteric. All color space conversions in
Photoshop are preformed in a high bit space. When Use Dither is turned on,
Photoshop adds a small amount of noise when the 8-bit channels are converted
into the high-bit space. This makes banding or posterization much less
likely to occur (that's a Good Thing). But if your final output is JPEG,
this tiny dithering is likely to produce a larger file size (because it
introduces more discrete colors into the image), and if your using Photoshop
for scientific work, when you need to perform quantitative analysis on
colors, you should turn this off as it will introduce noise in your data.
Otherwise, leave it on. "
Andrew Rodney
http://www.digitaldog.net/
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