I answered "both" but, the fact is, the latest recurring dream is more like items in duo-tone surrounded by full, vivid color.
My PTSD is combat-related. The latest set of recurring dreams is always about an intersection of roads. On each of the four corners of the intersection is a sandbag "fortress" of sorts... a short tower of sandbags and I recognize them as being checkpoints from both Israel and Beirut (Beirut being the war zone).
The thing is, the sandbag towers are completely unmanned and nearly duo-tone in color: Sand highlights and black dark tones. The REST of the intersection is vivid and I recognize them in full color with people moving about as if they don't see the check-point: Boston, DC, Florida, my home town in Hadley, Massachusetts. Always, I'm with someone and they're unconcerned about the checkpoint and just walk through. I try to stop them and wake up.
Anyway, the sandbags are always this bad "Photoshop" of the rest of the scene. The sandbags are duo-tone (browns and blacks) and the rest of the scene is vivid color.
Of the rest of the nightmares, anything Beirut is color if it's a memory. Everything else ... either black and white, or I don't remember color. Regular dreams are NEVER color except when I was at high altitudes (camping in the mountains, e.g.)