echo "Y"|inkscape -E image.eps image.jpg
This is not working, I tried to send an enter code to, but that didn't work either. The problem appear in the 0.48 inkscape.
As for the ImageMagick, I think that it creates artifacts when I do the conversions; however, it could be my own perception.
I think that inkscape produces better results.
I would check the eps2png.