Quote:
Originally Posted by gregbradley
I also often use Gradient Xterminator early on after levels/curves if there is too much background green or red etc. Not sure why I sometimes get this even at a dark site - perhaps lower altitude images suffer from atmospheric extinction and also this large chipped camera is more sensitive to the need for good flats than other cameras I have used.
Greg.
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Hello Greg.
Are your referring to a gradient or colour cast?
It's usually blue filtered images that suffer from atmospheric extinction.
I occassionally have green/magenta gradients in my images even though my site is reasonably dark.
It finally dawned on me the gradients were processing induced. I found my RGB images were gradient free but when combined as an LRGB the gradients appeared. (The L images were also gradient free). It was caused by overstetching the L images.
Even the choice of combining software can effect gradients.
Regards
Steven