I've started 5-6. Photoshop reports colour space as sRGB IEC61966-2.1. (As long as we retouch only, avoid attempting colour corrections, and save in the original format, then it shouldn't matter ?) Chris, Please confirm types of retouching expected: remove planes? remove cars & trucks? remove trees & plants? remove shadows? remove edges of buildings? remove light poles and other poles? removed shipping containers and cranes?