vector format and cmyk mode?

[arindra]

sir,
how can i convert any fomat(.jpg,.png,.pdf...) to .ps format which produce vectorformat
and the output image is in cmyk mode.
I use this command:
convert 1.jpg 1.ps (for jpg to ps but it not produce vector format).

convert image.jpg -profile sRGB.icc -profile SWOP.icm image.tif(RGB->CMYK)
convert image.jpg -colorspace cmyk -density 300 image.jpg(RGB->CMYK)
convert rgb.jpg -intent relative -black-point-compensation -profile icm cmyk.jpg(RGB->CMYK)