Having the toughest time figuring this out. I've changed color settings (RGB/CMYK) and messed around with color profiles but always gives me green-ish colors printing from Illustrator.
Funny thing is, I set some keynote document up and use the same colors to print, and it works totally fine. If Keynote can, why can't illustrator???
I'm using the Canon IR Advanced 3330 printer. Any help is appreciated.
I know this is a late response, sorry - but as I just started my sublimation business, I am getting this same problem. If I do NOT start with a NEW doc in cmyk, it keeps reverting everything to RGB. Even then, it has only worked "most" of the time. Sadly, when placing or opening (and then copy and pasting) an image, even one I created from scratch in an RGB doc, Illustrator is restructing it as RGB. WHY? The print copies shows grey. The screen shows grey. The screen colors match the print. It's an Epson ET-2850 using an ICC profile from the ink manufacturer to adjust for their ink, and on solid blacks, it works! On some greys, it works!? On other greys... no? WHAT? WHY? It's not my heat press or shirt (cause text works fine on hard objects and by the pics, you can see the colors working??), it's clearly not my printer ... it's illustrator using RGB to make grey or black and seemingly random??? It's not the unique Hippoo ink ICC profile for the printer because that is matching original image quality quite well. And, I've tried the solutions MikeGondek listed (and I appreciate those) - but that hasn't fixed it. The attached pics - the triangle is excessively green: but - A NEW cmyk print doc. Instead of redrawing the triangle, I imported it form the bad RGB doc and used a new fill to 50% K as previously noted (And on reopen, illustrator is not reverting it to RGB, so the CMYK "appears" to be holding??). You can see on the star wars attachment - color on page is absolutely grey. But in print, clearly, the software was using an RGB code that resulted in green (and no, I have no ink shortages). I've been designing for years and never had this problem. I would not have even KNOWN about this if I had not started sublimating because on paper - this looks right. However, sublimation requires colors to be a true, genuine CMYK, not RGB, so when transferred, these problems do not exist and I have NO idea what to do. I am totally defeated by this. Any solutions would be great. I am running the most recent versions of Adobe for PC. I pay a lot for this subscription and only use 2 programs... so I pay a lot for things I don't even use ... but it "was" worth it up until this mess. I am 3 weeks into trying to fix this and searching the internet for answers.
When gray tones print with a slightly green or red cast or even both from one end to the other in the same print job it is sometimes the fault of the printer. The first large format printer we bought for our shop was a Roland VersaCAMM thermal inkjet printer. It worked great for the most part. But we went through hell on any occasion we tried to print things with a neutral gray, such as brushed aluminum textures, simulated diamond plate, etc. The printer just physically couldn't print a perfectly even gray. I don't understand why. I could wrap the end of a print around to the edge of the other end and the gray would be different regardless of the artwork having the same gray value across the design. Our problem was solved when we finally retired that printer and switched to using a HP Latex 360 printer (also with a different RIP application). No more grayscale problems.
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