I don't think you workflow has problem which will lead to Halo. But since your camera is Nikon i would like to suggest you to make sure that the" D-Lighting" function has already been switched off by you as this function will cause halo effect.
Using "Equalize" in PS can help you check dirty spots of your pics and also can help you see the Halo situation clearly if you can't recognize by normal version.
Pressing Ctrl + Shift + Q can change into Equalize Version and Pressing Ctrl + Z to return to normal version or you can find it through :
Image -> Adjustment -> Equalize
Ex: From this one
Equalize Version :
You can see that there is a black circle around the aircraft and that's the halo.Actually i can see it clearly without using Equalize.
Besides, pay attention to here :
Two obvious dirty spots can be seen/checked through this version ,but screener will not use it when they are screening pics. But the halo of this one looks obvious even without using it.
So if the dirty spots are not obvious in normal version i think screeners will not give you correspond rejections.
CassidysVacay wrote:Harry you are always very helpful. Thank you. That large dark area (halo) is quite large above the airplane. Are there any ways to fix this or should I throw this one in the trash? How can I prevent this in the future after making sure D-lighting is off?
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