[Will Nuttall]

Try creating a second layer with flat colour of maroon or something similar, and place your your original image as the top layer. Apply ‘Screen’ mode to yoru top layer, then switch to the Channels Palette and Ctrl-Click (Cmd-Click on Mac) on any of the channel thumbnails to make a selection. It *might* be that one or a combination of these allows you to copy and paste everything but the black onto a new layer.

HOpe that works but without seeing the image it’s not easy to say.

http://www.kiln.com.au