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Old 10-21-2012, 06:39 AM
guyburns guyburns is offline
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Default The Art and Science of Reproducing Kodachrome

Just thought I should let readers know that I have put together a PDF about how best to reproduce Kodachrome and other slide types. I purposely did not say "scan" as scanning is only one part of getting a Kodachrome slide into another format.

Cliff Rames was kind enough to proof read the early versions of the PDF and offer suggestions. He had this to say after the final proof, but I was unable to include his technical comments in the PDF so here they are (26 Aug 2012):

Hi Guy,

I read through your final version and it looks like a winner! I also tested your editing workflow on some of my own Kodachromes, and I must say that it is very well thought out and effective. It makes a lot of sense to me.

Interestingly, in your Curves 2 color adjustments, page 62, bowing the curves up and down from the mid-point, has the main effect of aligning the Kodachrome characteristic curves. It is effectively the gamma adjustment for each curve needed to neutralize the grayscale, although it's not obvious.

To use my existing Linear scans with your workflow, it was necessary to first convert to a gamma > 1 space. You might want to add a note for those who have linear scans, that it's a necessity to convert to a gamma workspace, since curves and some of the other Photoshop tools are awkward to use on linear data. Of the standard editing spaces. only ProphotoRGB can contain all of the Kodachrome gamut. I can just imagine that your document will be read and applied by other people like me with linear scans, since in some circles (UseNet, filmscanners mailing list, etc.) the conventional wisdom has been that it's best to scan and profile linear. Under your constraints of avoiding color space conversion, scanning into a gamma space is a necessity as your research has shown. Not everyone is operating under the same constraints so I'm just suggesting a way to head-off potential criticism from experienced scan operators who come across your document.

Best regards,

Cliff
The PDF (234 pages) has been set up to allow easy and informative comparison of images by directly overlaying them in an interactive PDF. My findings may surprise some readers. The PDF (an incomplete version) can be downloaded here: http://www.mediafire.com/download.php?qc67n2gkdz3viyp
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Old 10-24-2012, 01:16 AM
RichardE RichardE is offline
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Very interesting indeed...hope you can keep us updated on this. I'm sure that there are a lot here who, like me, are working their way through many years of Kodachrome slides, extracting useful and historic images, and printing others to get the best possible results.
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Old 11-07-2012, 01:36 PM
hujev hujev is offline
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Always looking for hints on this. Usually I ignore whatever I've heard or read and start from scratch every scanning session ... So maybe I ought to go through this and take notes!

How come this version is 'incomplete'?
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Old 12-04-2012, 01:27 PM
Chris Sweetman Chris Sweetman is offline
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Default Bump

Bump :confused
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