Gradient issue from purple to aqua using ZWO FF107APO and ASI2600MC with stacking on APP

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Francois Gregoire avatar

I am using a ZWO FF107APO and a ZWO ASI2600MC Pro, and APP for stacking.

All my pictures come out of stacking with a gradient across from deep purple on the upper left corner to aqua on the lower right corner, without any processing.

Any suggestion?20260114 Seagull Nebula ZWO wide filter light.jpg

I attached a recent picture of the Seagull Nebula.

Thank you for inputs.

andrea tasselli avatar
That's just a light pollution gradient. You should flatten the image and do a background neutralization and finally a colour calibration. How to do that in APP I have no idea.
alpheratz06 avatar

APP offers the capability to flatten and neutralize background