What is the term knock out in Graphics

[Wade_Zimmerman@adobeforums.com]

Now you don't have to be so quite Gail welcome to the forum, don't some of these guys really know their business? They can make anything happen.

[John_Kallios@adobeforums.com]

Object multiply is what the artist just does for the visual effect reasons.
Right???




Yes, I would say that the use of multiply is mainly for the design stage. But, there is no absolutes. Multiply is a good way to get a element that cannot have the overprint attribute set overprint the bottom element. (as long as the element underneath does not share the same color)

I am also in prepress and do not believe in changing and will not change cmyk values without a client's consent.

The only exception has to do with trapping, overprints (when overprinting will not affect the design one bit) and add rich blacks as needed.

I understand what you mean by the drop of for 2% and below for flexo and the fix you do is needed for your processes and that would also fall under a fix to a file without clients consent.

So I'm not sure if the artist intends for a rich black if using a cmyk
value if the black is less than 100%. Maybe they're looking for somekind
of dark brown?




This is a judgement call. If K is 98%, then it is safe to assume a rich black. If K is around 80%, then I would suggest flagging it and contacting the client for clarification of the color.

Is this a correct assumtion, 100% black would be rich black.




IMO 100% black can be converted to rich black without clients consent only if the printing process requires the black to be a rich black so that the finish piece actually appears "black" without the need of running the black up and distorting the rest of the elements.

Other than that, prepress (as I am sure you are aware and practice) should NOT muck with clients files in any way. Any issues seen must attain approval from client before changes are made.

Only exception is when due time is such that you have no choice but to fix the file to make the due time. In this case, no matter what you do, you will be blamed for anything that goes wrong. This only applies to changes that making the change is a given.

I was kind of confused with the questions, so I hope I followed your train of thought and did not go off on a tangent.

[Wade_Zimmerman@adobeforums.com]

Very interesting exchange.

[Dee Holmes]

Exactly what I thought, John. Thanx for the backup.

[Lince_M_Lawrence@adobeforums.com]

Hi

The response to the posting by Mr.Brijith was tremendous, and very-much
informative (and the flow of information is pouring on-and-on).

Yesterday, I have made a posting similar to that of Mr.Brijith (KNOCKOUT
?????), which is virtually reflecting as a response in this thread.

I got most of my doubts cleared. I will get back with some of the other
doubts which are still prevailing.

It will take some time for a newbie like me to get the information
utilized, and to work out with it.

Thanks,
Lince M. Lawrence
[email]lince@india.com[/email]

[Brijithkumar@adobeforums.com]

Same with me too Mr.Lince, Iam so much excited seeing this much response, but iam still confused with overprint and knock-out.Can u just please wrap up JohnSlate all the points from jonf,deehomes and good lot of others into a simple matter.

[jonf@adobeforums.com]

"Actually, you were using multiply and were just referring to it as overprint."

Was there such a thing as "multiply" in the pre-computer days?

The more I think about it the more I suspect i was shooting off my mouth without taking the time to think this through. Before digital methods defined the terms as we're using them now, what did you get when you asked for an overprint? For instance, when I created a pasteup board, and included a photo on the main board, then registered an overlay of a headline, and requested the printer to "overprint" it at 50% black, what did he do with the black plate? Did he first knock out the headline from the underlying photo, then strip in a 50% screen of my headline? Or did he burn the film twice to add a 50% screen of my headline onto the black neg? I honestly don't remember. Are there any old-school printers out there who can explain this? What I'm seeing when I print out the separations from an overprint done in AI doesn't look "right" to me, but it's been a long time since I looked at any film that included overprinting of screened colors.