Thanks guys,
Kev, i like your style. Especially "trying to remember what you did"
I would say that reprocessing any image will most certainly achieve different results.
I have seen many you tube videos on processing astro images and many just settle for levels and curves.
The others use masking techniques etc.
PS is a powerful product, almost endless in the combinations of enhancements to achieve the final pic.
I have seen many variations of the same nebulae and often wondered what colour is it really like. how does mine compare.
I guess there may not be an answer to that, and that the end result is personal taste.
Is there somewhere where we can reference nebulae to compare our renditions?