Reading and repling from phone and only saw 1 barcode image; but if I am following you right you are engraving on black anodized aluminum.
The barcode needs to have black bars but the laser is burning then into the aluminum which is reverse of what you need. As already noted, you will have to invert in CD to laser away the black around the barcode bars to leave them black and remove the area surrounding them. That should give you black bars with lighter surrounding area for code reader to work.