Remove backgorund in fire/flames?

Hi,

i have a picture of fire lifting into flames. I need to add this to some print artwork in coreldraw 13. what is the best way to do this? the flames are on a black background and the canvas i am putting them onto is also black… but when i just add it like that then it prints with 2 different blacks… i have tried cropping it but im not getting a great result… any advice/ideas please

cheers.