Illustrator//PS to ONYX RIP - SPOT WHITE

[Think713]

Whats up everyone. So here's the deal.
We're currently running a HP R2000 flatbed, and starting to produce some white samples to see what we can and cant do with the software and the printers capability.


I'm currently running into 2 separate issues.

Issue #1: Registration color being printed instead of RIP only seeing SPOT1 for white layer.
......so per the HP guide I had to set the spot layer to an overprint channel and make sure that the white layer was a spot color. I have done this. Now where I think I went wrong is that the spot color itself is 100% CYAN vs any other color. SO when the printer printed the white, it also dropped the blue into the print as well. Whats more curious is that the blue which did contain gradient information printed the gradient correctly, however was not reflected in the white. Now the final result was pretty cool, and looks great. But I only wanted white..What color should the white be set to? Does it matter? And should I avoid all CMKY 100% mixes assuming ONYX is going to read them as registration colors. So far there is nothing telling me NOT to do this, so I figured it would be sufficient, but it doesn't seem to be.
Issue #2 : Phothoshop is not letting me save a TIFF with a SPOT channel denoted in a grayscale image.
ONYX requires that you have an inverted spot channel in order to read the white information correctly and put it down on your media. So when I go to save, the actual save option for TIFF is non existent. I just sat on adobe help with remote access to my computer, and they were not able to resolve this issue. They assured me this is not a bug. IF this isnt a bug, then what am I doing wrong to get this to save correctly?

Any and all help is much apprecaited. Thank you in advance.

 

[balstestrat]

If you want white you only add Spot1, that's it.

Don't know about the photoshop.

 

[P Wagner]

Here is a link to a series of video tutorials for various RIPs (including Onyx) and design apps (including Adobe) for handling white ink. Your questions are all answered in these video segments:

https://www.youtube.com/results?search_query=lee+manevitch+hp

 

[Think713]

If you want white you only add Spot1, that's it.

Don't know about the photoshop.

Yea I got that part sorted. When printing however, it also dropped blue from that layer that I chose to use as the spot. Spot1 is telling onyx to do the white yes, but for whatever reason it also printed the blue from that layer. Not only that it also printed it as the gradient that the white was suppose to drop.

 

[Think713]

Here is a link to a series of video tutorials for various RIPs (including Onyx) and design apps (including Adobe) for handling white ink. Your questions are all answered in these video segments:

https://www.youtube.com/results?search_query=lee+manevitch+hp

Cool I'll check it out. Thanks. I have seen one of these videos which was my initial start to this process, but it seems hes got some extra info on these so I'll definitely go over it. Thanks again.

 

[Think713]

SO I wanted to reply to you guys on the second half of my issue here. I did figure this out.
So in order for the TIFF to populate in the save options, the file must remain with its source channel inside the channel stack with its contents deleted. Only then will the file type remain as a grayscale and allow you to save the spot color information. IF you delete that channel, rather than delete its contents, it turns into a multichannel mode, and does not allow a TIFF save option.

 

[balstestrat]

Yea I got that part sorted. When printing however, it also dropped blue from that layer that I chose to use as the spot. Spot1 is telling onyx to do the white yes, but for whatever reason it also printed the blue from that layer. Not only that it also printed it as the gradient that the white was suppose to drop.

That just means you didn't do it right. It won't print the cyan if it's Spot1.
You must have had two objects or something etc.

 

[FrankW]

Sometimes a different than transparent (eg white) background does strange effects for several reasons, for example printing a few dots of a different color into white areas. For example when printing in absolut colorimetric rendering intent, what means it tries to simulate a special paper white.

In this case you should switch your setting to relative colorimetric, or you could set a pure hue for white (see attached picture). Would be more professional to search for the reason, but this could be a quick solution. Of course another issue could be a technical problem with your printer.

On the other hand