If you want to print it, you should export a print standard pdf as there are PDF/X-1a, X-3 or X-4.
And you have to be aware that only Adobe Acrobat and Adobe Reader are correct PDF viewer. All others are only supporting a substandard of the PDF standard.
And you have to be aware that only calibrated monitors are able to show correct colors.
@Stephen – you told us where you see the incorrect colors. But you did not tell us where the printing company sees the incorrect color. What is there application? An iPhone has no color management. It is no color proofing device. Not at all!
As Willi already pointed out: Acrobat Pro will qualify, Adobe Reader will qualify.
"Correct color" is a wide field… ;-)
And on not-callibrated monitors or devices the numbers of individual colors count (always coupled with their output intent, of course).
The problem is I have no control over what software the print companies use. I use different print companies all the time and as I'm not a graphic designer i do not fully understand how it all works. I know an iphone isn't an accurate way of colour proofing but it has replicated exactly what i had printed rather than what i designed.
Monitor calibration is not the issue, these aren't just slight colour variations, these are completely different greens. I know if I export to JPG or PNG then the colour is guaranteed not to change whatever software they use. But i know that's not the preferred format so how can I guarantee the pdf will not change colour?
What is the source color space?
What is the output color space?
How do you convert from one to the other profile?
Sorry my knowledge of indesign and graphic design is very basic so unsure of what you mean. I convert just using the pdf settings in that screenshot. I have the CMYK colours that I want but unsure of what they change to as my laptop never shows the incorrect colours.
So tell us what the working color space is in InDesign (Edit > Color Settings), and what the CMYK values of those greens are.
I'm guessing the fact one is CMYK and one is RGB is something to do with the problem? No idea how ive managed that
Your "correct" colors are a pretty good match for what I see on my calibrated system, though I see less yellow in the RGB green. I suspect the problem is in how this is being handled at the print company -- some last century workflow that ignores color management.
Okay, so how can I guarantee the colours will not change? Is there certain things I can do to the design colour settings or is there settings in the export pdf? Or is the only way to guarantee to export to an image file?
Use a reputable printer and get a contract proof before the run.
Okay, so can no one tell me a way to guarantee colours using a pdf by settings rather than gambling the print company know what they're doing?
No. Output is entirely dependent on the system doing it. If the workflow is bad, or the equipment is set up improperly there's nothing you can do on your end to fix it.