Hi rod I've picked a few different ones out so that you can see how they differ from each other even on the same aircraft at times , they might be useful to you as some sort of reference, I've not altered the colours at all its how they were taken on the day I've only cropped them so there not so big and focus on the exhaust area for this thread, but as you say there is so many factors that can alter a picture as you take it let alone how you have your monitor set and how our own eyes see the colour when you look at them later on, it can only be a guide in the end its down to what you are happy with when its finished