The result is "green" debayerized images because the Bayer mask consists of one red, one blue, and two green pixels. In Siril 1.2.0-rc1 there is a "Chain Channels" button in autostretch mode. This results in a more balanced image. But only when displayed in Siril. The images must be color calibrated before saving.

I have no idea about 2x2 bin images have bw pallete. They must also be debayered.

Can You share examples of Your images?

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