Blue cast with Kodachrome slides

[oaklodge]

I have hundreds of Kodachrome slides that I need to scan and save onto CD.

When sampling the slides they all seem to scan with a blue cast. (I have calibrated the scanner)

How can I avoid this without processing each one manually.

Thanks

_________________
Michael Tissington
Oaklodge Technologies
http://www.oaklodge.com

<font size=-1>[ This Message was edited by: oaklodge on 2002-03-28 04:01 ]</font>

[Tomaz Klinc]

Sorry to say, but we are in the same boat and out of luck. Due to their unique chemistry (essentially B&W films, with color added during processing, and remaining silver particles interfering with both scanning and ICE), K'chromes produce a blue cast that is difficult to correct even in Photoshop 6. Nikon Scan v3.x for LS-40 scanner and above has a special K'chrome setting, but results are reportedly only mediocre. SF's own IT8 calibration with supplied Q60 Ektachrome target, does, in my experience, more harm than good.

[degrub]

Kodak does offer a Kodachrome Q60 target that you can try and see if that helps. Certainly should be closer than an Ektachrome.

Frank

[Tomaz Klinc]

"The KODAK PROFESSIONAL Q-60 Targets are available on KODAK EKTACHROME
Professional Film in both 35 mm and 4 x 5 inch formats and on KODAK
EKTACOLOR Paper."

This is a quote from Kodak's website; curiously, even though no Q-60
target on Kodachrome is said to be available, a data file K3199909.Q60
for this film family is offered. Since my SilverFast IT8 calibration with
Ektachrome target plays havock with Kodachrome scans (shadows turn into
dark ugly blobs of crimson), I wonder how that data file could possibly be used.

[degrub]

Kodak catalog number: 157-5141 Q-60K3 Kodachrome K3 35MM
Mine was from 1999:10
i had to order from a local Kodak dealer and they may have had to call Kodak to get the part number.

Hope this helps

Frank

<font size=-1>[ This Message was edited by: degrub on 2002-04-09 19:41 ]</font>

[Tomaz Klinc]

degrub, I appreciate; thanks a lot.

[asto999]

Hi, just read this older topic.
But as others like myself will browse here, too, it might be of interest that the removal of color cast with Kodachrome can be done without a special target, too:

http://www.marginalsoftware.com/LS2000N ... _caseI.htm


Regards,
asto999

[brett]

Hi all,
I have a couple of solutions that you might want to try in your attempts to get a good scan from kodachrome slides.

1. Scan the slide using 48bit HDR mode. The resulting tiff file will be a raw image scan that you can correct in either Silverfast HDR or Silverfast DC pro and you can batch scan the files and work on them later. This method works well if your slide is perfectly exposed. Here's an example of one of my shots using this method:
http://www.airliners.net/open.file/574140/M/

2. If your kodachrome slide is under or overexposed you can still use the above method, but you'll have to increase or decrease the gamma. It might also be helpful to check the "HDR" box next to the gamma box. This box includes the gamma slope information in the tiff file so that when you edit the file in Silverfast HDR it can recognize a higher or lower gamma slope. The problem here that unless you have alot to the same problem exposure kodachromes, you'll have to adjust the gamma for each slide.

3. Try v**s**n. Don't get me wrong, Silverfast is great. But it can't do everything and in this instance, v**s**n is superior and it includes a default setting for Kodachrome. It can even color correct that blue hue that is so hard to get rid of in kodachrome slides. Be warned however, that v**s**n creates a slightly grainy file. This is usually easily corrected by using a higher setting of grain reduction in vue scan or edited later in photoshop. The good news here is that you can batch scan varying exposures of kodachrome slides without changin settings before each slide.

Good luck,
Brett