In PS 7, Go to Edit > Color Settings > In the Working Spaces area where it says CMYK, in the scroll down menu, select Custom CMYK (at this point, you’ll want to write down the Name, at the top, so you can revert to those settings once this little experiment is over); once you wrote down that Name, change the Black Generation to None and name that setting (let’s say Black Generation – None) > click OK.
Go back to your Photoshop document and change the color mode to RGB, then change it to CMYK again…Voila! Look at the Channel Palette, there is no black in the Black Channel.
It’s the fact of changing those settings and then going from RGB to CMYK that will change the Black.
I learned that in Dan Margulis’ book: Professional Photoshop
Thousand thanks Rene
for the tips it works!
Yes the cmy makes most of the color in the CMYK process. what the black adds is the shadow detail. this is what snaps the picture out and makes it crisp.
Just to clarify something here.
What this method does, is redistribute the information in the black channel into the CMY channels; it doesn’t delete the black information, just re-distribute it; therefore not a whole lot of that crispness is lost.
therefore not a whole lot of that crispness is lost.
maybe not on screen.
100% C + 100% M + 100% Y = MUD
(and that’s brown mud, not black mud).
Print it and see!
OK. OK.
You don’t want to do that kind of thing very often either. And I don’t suggest you do it, unles you know what you’re doing.
We’ve used it on cheque backgrounds, because the black ink interfered with scanning account numbers. Re-mapping the black plate solved that problem.
We’ve used it on cheque backgrounds,
arn’t most of these pictures ghost images?
arn’t most of these pictures ghost images?
Yes.
But the black ink is the most critical.
Even a 10 or 15% of black (I don’t remember the exact amount) can interfere with the scanners reading those account numbers.
The Printer will print samples and he has an instrument that will tell him if the background will interfere with the Bank’s scanner. If it does, he’ll go back to the designer and ask to fix it.
I can understand not using black in a ghost image.
