RE: Strip Black Channel
RE: Strip Black Channel
- Subject: RE: Strip Black Channel
- From: Minoru Shimizu <email@hidden>
- Date: Sun, 28 Jan 2001 04:41:24 +0900
At 10:25 AM -0500 1/26/01, Pete Merck wrote:
>
The size of the 4c space (generaly) is smaller than Adobe RGB, so converting to the larger RGB space doesn't expand the color range. The only control you have now is how you want to set your ucr/gcr. Strippng out the K leaves a weakened CMY that is now forced to reconstruct a K channel.
Pete,
Thanks again for your post.
It seems that my initial explanation was not enough.
I didn't mean we scan into CMYK color space, but just exporting RGB scan as a CMYK file. There is absolutely no information recorded in the black channel.
Therefore, when you open it in PS, it looks muddy because it is rendered as CMYK, but after deleting the blank K channel and converting to RGB (this is in fact, just renaming Multichannel CMY as RGB), you can get pure RGB records.
We have been doing this for many years, since we used to be a Dye Transfer lab until 1993. For that process, we were making contone separation negs on gravure film. We also output to film recorders since the first generation of CSI Fire 1000 which is now replaced with LightJet 2080. So we feel rather comfortable with three color records than CMYK numbers.
You might want to check out ColorBlind web site, there is an article by Don Hutcheson, titled "RGB Scanning for Color Management".
I think it will better explain what I'm saying.
http://38.187.9.49/color/learn/docs/CMS scanning_2.pdf
Regards,
Minoru Shimizu
Nippon Color Engineers Co., Ltd.
Tokyo, Japan
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Minoru Shimizu
Nippon Color Engineers Co., Ltd.