[magick-users] Background issue converting .eps to .png

[Michael Stroh]

Hello. I'm trying to convert some graphs I have saved as .eps to .png  
files. When I run convert version 6.3.3 on my laptop, it performs the  
conversions just fine. However, my desktop at work uses 6.4.4 and when  
I try to do the conversion on it, it seems to handle the background of  
the images incorrectly (both are Macs). I'm not sure if it is treating  
the background as a transparency or what the issue is.

As an example, I have an image posted (www.astroh.org/image_test/lightcurve.png) 
  which shows how the conversion ends up on my desktop. However, I am  
able to perform the conversions from .eps to .jpg fine (www.astroh.org/image_test/lightcurve.jpg) 
  but the quality is terrible. The .eps file that I'm converting from  
can also be found in the same folder as the other two images (www.astroh.org/image_test/lightcurve.eps) 
.

I'm using simple commands like

convert lightcurve.eps lightcurve.png

Are there any additional things I can try to get the .png file to look  
the way I want it to?

Cheers,
Michael Stroh