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Re: [OM] IMG: Friday Tulip - Jim N.

Subject: Re: [OM] IMG: Friday Tulip - Jim N.
From: Bob Whitmire <bwhitmire@xxxxxxxxxxxxxx>
Date: Sun, 27 Mar 2011 12:53:52 -0400
In a perfect world, I edit in ProPhoto space, at 16 bits, on a 64 bit CS5 
platform. Every adjustment gets its own layer, each clearly labeled and grouped 
according to whether it's a global, regional or local adjustment. Even 
sharpening gets its own layer. Then I soft proof and print to see if I actually 
like the way the image looks on paper. (Yep, soft proofing gets it's own group 
of layers, usually a combination of curves and hue/saturation.) Sometimes I 
make adjustments to the file after printing to compensate for stuff that soft 
proofing doesn't show.

When it's like I like it, I duplicate the file, flatten it, and use that file 
for printing. Sometimes if I'm not sure about the final result, I'll leave the 
soft proofing adjustments as a separate group. Still a smaller file, just not 
as small. <g>

I think for those who aren't so technically inclined to know how those 
histogram spikes and jaggies translate to print, what Chuck is saying is that 
if you're making a lot of adjustments, editing in 16-bit mode is much less 
likely to produce effects such as posterization in the final image.

Do I not recall that most printers convert their images to 8-bit on the fly?

--Bob

PS: That's in a perfect world. In the real world, my files can be real messes.


On Mar 27, 2011, at 12:04 AM, Chuck Norcutt wrote:

> However multiple 
> brightness, contrast, saturation, etc, etc, adjustments gradually 
> introduce more and more rounding errors into the 8 bit calculations. 
> Using 16 bit values reduces the cumulative effects of those rounding 
> errors which has a tendency to introduce spikes and the jaggies into 
> histograms.
> 
> So, forget 16 bits on the final, processed output.  No one can see it... 
>  even if you think you can.  :-)

-- 
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