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.

However, I would like that Inkscape has an option to tell it to embed or link the image when doing the conversions.
Do you know, if there is any place to submit a request?