Unless otherwise indicated by the lab, your best choice is to choose sRGB.
Greenish and perhaps a little pale is a symptom of AdobeRGB images being interpreted as if they are sRGB images so Export as sRGB not AdobeRGB unless the printer explicitly says otherwise.
Thanks to the both of you for your suggestions.
The lab says only to "embed the colorprofile used when editing, such as AbobeRGB or sRGB". So even though I edit in ProPhoto, converting to AdobeRGB before sending them the image should be okay.
But, I'll try sending them an image converted to sRGB as well and see what happens.
I am struggling to get printed output from a professional printing service to match what I see when I softproof on my monitor. The printed image always looks considerably more green and warm, although whites are ok. Blue skies tend to get warm greenish. The printed image often looks like a warm instagram filter had been applied.
- I have calibrated and profiled with a Spyder 3 Express using BasICColor Display 5 software, previously also used the Datacolor software that came with the calibrator. After this, what I see on my monitor "looks normal" (skin tones, landscapes etc.)
Could be the calibration targets (how you asked to celibate white point etc). Could be the output. Could be the ICC Profile. Could be your file. You have to decide which is which.
Start here: Why Are My Prints Too Dark
Then download a good color reference file like this one: http://www.digitaldog.net/files/2014PrinterTestFileFlat.tif.zip
Soft proof and see if any green or odd color cast appear. If so, probably the profile but use it and have a print made. The output should look good (neutral in neutrals, reds that don't appear yellowish etc).
Generally speaking, if you send Adobe RGB (1998) and the other side assumes it is sRGB, you will end up with desaturated colors. This isn't the fault of Adobe RGB but rather assuming that data is sRGB which it isn't.