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My friend Marc Aguilera from Color Critical is here in my shop working today. He's G7 certified. Ask away and i'll forward the question.

and adobe has its own as well. most of us do it in the rip, true?

The RIP reads through the postscript from top to bottom. If it matches the DocumentCustomColors name to the built in library it uses the LAB reference it has for that color. If not, it flows to the next row(s) to find and alternative. This would use the rendering intent as setup in the color...

Both work the same way, they use the LAB->CMYK conversion provided by the printer icc. True they bypass any sort of input profile since it is not a true source->destination conversion like the typical RGB->LAB->CMYK or CMYK->LAB->CMYK. But they both certainly use the output icc. Each workflow...

How about Convex abv?

I don't know what this means. If i'm thinking right, they should NOT match. The CMYK or RGB would be limited by the working space and the spot would not. Can't say i'm confident in this, but that's my first thought. Maybe the test is to do the lab in the RIP and test that against the spot...

I'm curious if it "reads" the lab values or the alternative RGB or CMYK values Illustrator puts in the postscript according to the color format of the overall file. The RIPs i'm familial with will not read the lab but either recognize the name and use the RIP's own internal lab reference or...

Rooster's post is 100% dead on and appropriate. I don't think he was being trite or condescending at all. Some questions require a baseline of knowledge to be able to answer in a post in a forum. This is one of those for sure.

There ya go. Problem solved. Love it.

Color drift is very common. Especially if you have temperature and humidity changes where the printer lives. Proper "calibration" needs to be done with a spectrophotometer. One of the most popular is the i1 by X-Rite. Note that to simply do a "calibration" all you need is the instrument. To...

I'm curious what rendering intent you're using during conversion in your RIP? In theory it should be relative colorimetric. Also, how are you naming the spot color and does that name match up with a spot color reference in your RIP's spot color table? Most of the RIPs have a table that lists...

Totally viable as long as you have the awareness to juggle the different files. Yup. yes. Or start with a true Pantone chart that is Pantone named colors, not CMYK values. This vector chart could be rasterized with Photoshop directly into whatever space you want to test. Or, and this may be a...

Absolutely. Thing is, unless the file is created in Adobe RGB there is no advantage. IOW, if you have an sRGB or CMYK file and convert it to Adobe RGB, the color should be exactly the same as it was in the originating color space. So, if you design in Adobe RGB or convert images from your...

I'm astonished there is so much bizarre misinformation in this day and age; especially from a manual. If your color management is setup conventionally, all incoming color gets converted from whatever the color is in the file to LAB then to CMYK for the media profile. So, to design in RGB...

And, it would allow you to test different RGB spaces as well. Perfect suggestion Rooster.

Yes, that means your color management is working. Simply put, you tested the same file ran through different workflows. Some don't make sense from a production perspective, but make sense when you are testing/learning. Also, if your color is really working, you should get very close results...

So then i'd guess you are not applying an output profile in your RIP? If you are, the "purity" of your solid colors will be determined by the ICC in the media profile and the Photoshop numbers are not really relevant.

That instrument is a colorimeter - perfect for doing monitor calibrations and nothing more. You need a spectrophotometer and proper software to go with it. Don't expect to get very far with the demo software.

you may also try dropping it on Distiller and then try opening the resulting PDF.

Regardless of the techno bull the process you describe should work fine. Yes, there are ways to improve on it further. But for a safe, simple, repeatable process that avoids all the PDF and EPS file problems, you're likely safe 99% of the time.