Newbie needing help with a logo

Hi,

I am very new to CorelDraw 12 and am trying to make a logo.  I have used the logo tutorial successfully.  I have a bitmap of a treble cleff sign that I am trying to change the color of.  The original bit map is green and I need 6 of them and each one a different color.  I have tried to trace the bit map and can change the color but it distorts the image.  The entire outline of the image changes color but there is no definition in the center of the treble cleff sign.  Any suggestions?