Export quality help
Hi forum.
I am new to Illustrator and forums in general so please excuse my ignorance.
I recently designed an email signature for my office and when I tried to export it, I could not get the quality I was hoping for.
In the Illustrator window the quality is great but as soon as I "save for web" the quality disappears.
Below is an image of the working dartboard:

Below is the image of the "save for web" preview:

Note the difference in quality...
I am trying to retain the artboard size of 500px by 150px. I don't know how to save this signature and get crisp lines.
Another thing is that on my monitor it shows up crisp, but on my Mac with Retina Display its blurry. A colleague mentioned that it was the resolution difference between the monitor and mac (monitor < mac).
I want the signature to be perfectly clear on all displays, not just low res monitors.
Please help!
P.S. I could post the file if it would help and someone could tell me if my settings are wrong?
