Re: 16 bit editing...

[Michael Greer <mgreer316@yahoo.com>]

Todd,

I don;t remember if it was you or somebody else, but they noted that the 16 bit
edited image appeared to be sharper. I noticed this as well but didn't apply
any sharpening to what I did. But the fact of the matter remains that I can
duplicate in the 8 bit realm what was posted for a 16 bit edit. So I'm still
waiting to see the 16 bit edit advantage.

--- Todd Flashner <tflash@earthlink.net> wrote:
> Good job Michael. That's closer to my expectations too.
> 
> Todd
> 
> > 
> > Mark,
> > 
> > Thanks for posting. That's the first time I've witnessed anybody posting
> > anything for examination when this topic comes up. I appreciate it.
> > 
> > Now, in examining the images and their histograms, what I see is a lack of
> > contrast in the 8 bit edited image relative to the 16 bit edited in the
> lower
> > end. If the exact same curve adjustment operations were performed, I don't
> > understand how this difference came about. Anyway, when I adjust the 8 bit
> > image's curve lower end to closely match the 16 bit image curve's lower
> end,
> > then the results are almost identicle.
> > 
> > I've posted the 8 and 16 bit edited images that you posted untouced. I've
> also
> > posted the adjusted (or corrected as I call it) 8 bit image. Alos, I've
> posted
> > the 8 and 16 bit histograms along with the 8 bit corrected histogram. If
> you
> > notice, the orginal 8 bit image has a relatively narrow range in the low
> end.
> > Narrow ranges will ALWAYS lead to dull/flat looking images. The 16 bit and
> 8
> > bit corrected ranges are pretty much the same and thus, the results are
> pretty
> > much the same.
> > 
> > Navigate to http://greeraa.com/albums/bit_depth/ to see.
> > 
> > --- mrkeene@attbi.com wrote:
> >> Mike,
> >> 
> >> Here is a real world comparison for you.
> >> 
> >> http://www.pbase.com/mark_kn/16bit_vs_8bit_editing
> >> 
> >> The image was taken with a Canon D60 in RAW mode and converted to a 16 bit
> >> TIF.
> >> A duplicate was made and converted to 8 bit.
> >> An equal amount of levels were applied to both images.
> >> The files were then resized to 640x480 for speed of loading and saved as
> JPG
> >> quality 10.
> >> No other manipulation was performed.
> >> 
> >> Download the images (they are ~80k each). Look at the original. Notice how
> >> far
> >> down in the shadows the lower portion of the image is. Now observe the
> >> Johnson
> >> grass in the lower right foreground on the 16 bit edited file compared
> with
> >> the
> >> 8 bit edited file. Draw you own conclusions.
> >> 
> >> Regards,
> >> 
> >> Mark K.
> 
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=====
Visit my digital photography web site along with a lot of other interesting stuff at http://www.mikegreer.com. Also, Greer and Associates (http://www.greeraa.com) offers studio photography, digital imaging services, web site design/construction, and training. 

Mike Greer

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