Image> mode> grayscale.
Bob
Craig,
It sounds like you need to paste the Grayscale image into the Black channel of your CMYK document rather than dragging it on top of your entire document as a new layer.
Thanx Rob, but I think you misunderstood. I have a CMYK file I need to keep as CMYK because of its present colour content, to this I want to ad a greyscale image and have it print using the black plate only, as a greyscale image should, so there are no colour casts/shifts on the press.
I have found one method: Before importing the greyscale image, convert the greyscale file to CMYK, then Image>Adjustments>Channel Mixer and check the ‘Monochrome’ box at the bottom and this will combine the CMY plates onto the K plate, a little level and contrast manipulation and it is close….
…. but I’m sure there’s a ‘proper’ way to do this????
thanx, CRAIG>
Craig,
convert the Grayscale to CMYK by a Custom CMYK
profile, based on your standard CMYK profile, but
with Black Generation = Maximum.
This creates three empty plates CMY and the image
is on the K-plate.
Good for the case that the page is generally in CMYK
but the single image has to be printed by K-only.
Furtheron, the workflow avoids the uncertainty about
dot gain or gamma for grayscales. Just the same dot
gain as in your standard CMYK profile.
Be sure that no further color management is applied.
This could easily distribute the K-only image on all
plates.
Best regards –Gernot Hoffmann
Craig,
You need to create a custom CMYK profile with Black Generation set to max
Len,
what´s the English version of "doppelt hält besser" ?
Best regards –Gernot Hoffmann
Hi Gernot,
what´s the English version of "doppelt hält besser" <<
The more the merrier? <g>
Thanx guys, these forums are invaluable – Gernott, more the merrier?, not if you saw our press. (hehe). Thanx guys, we got the job out yesterday.
CRAIG.
Craig,
good that it worked. The advice "Black Generation = Max" was given years ago by Len. For me it´s very important because I´m printing tests for all kinds of printers by RGB, RGB-Gray, Grayscale, CMYK, CMYK-Rich-Black and CMYK-K-only on the same page.
Best regards –Gernot Hoffmann
Another reason for device N color space in Photoshop.
when oh when will Adobe get it.
—
Use the old color look up tables to set black generation to max.
Convert the file from greyscale to CMYK.
Duplicate the image into your existing CMYK document.
