I've had to do this before. If you've already removed the colors so that you have just lines, duplicate the layer. Just to make sure you have just the lines you want, turn off the bottom layer by clicking on the eye next to the layer in the layer box. Then go back to your duplicated layer which should just be lines and 'select all'. Open a new 'document' (you may want to color it red or anything but white) and then paste the layer you copied into the new document. Now you should see the black lines of the crest on top of the red background. You can use this document to create the colors of the crest as you want them. If it's going to be in different colors, make sure you don't merge the layers until you're done. I'd color the bottom layer white when you're finished, that way you can crop and copy the image as you want it. Hope this helps!