Thanks so much @vlachorumsapiens
I've tested the latest xtrme GCam build and I'm very pleased to see Pixel AWB has finally been fixed. We are getting very close to a true Google Camera performance on the Mi 9 and Redmi Note 7 Pro. File size is also correct and image quality is closer to MIUI stock camera (exposure/highlight conservation is still better on stock camera though).
You can download the latest GCam build developed by xtrme from HERE
After trying various settings I've managed to find the best configuration which provides amazing image quality, with great detail, sharpness, color reproduction, noise control, exposure and dynamic range. There's one single XML config file suitable for both daytime and nighttime conditions which you can download from HERE
Here's a tutorial on how to import/export XML config files for GCam
After importing config file, go to Settings > Advanced > Noise Reduction > Untick & Tick again "Activate" toggles (sub-menu toggles also) in first three lenses. This procedure has to be done or else noise reduction settings won't be in effect.
For NightSight you need steady hands as image processing is slower, but provides maximum quality. There's also a small annoyance with my config as NightSight suggestion doesn't work with BSG Config PixelPlusNS Hdr+, but this issue will eventually be fixed.
I am sorry. This one.
https://f.celsoazevedo.com/file/gcam...90418.1850.apk
I've tried Arnova's version and it's actually very similar with xtrme's version. Color reproduction is pretty much the same when using certain libraries like "Default from Google" or "CSeUs", in combination with BSG Config PixelPlusNS Hdr+ and Pixel 3 XL for base settings. However what Arnova's GCam lacks is a special library called Xlib v2.2s which provides far better details than any other library, with much better exposure in the shadows. I've tried many different builds with many different settings, but none can come close to this one. NightSight is absolutely amazing, but image processing is slower than on Arnova's GCam because it needs more time to capture more light and apply the adequate post-processing. But the trade-off is worth it. Slower processing and maximum quality is better than faster processing and lower quality. It should come as no surprise since xtrme's version is the only build specifically tailored for the Mi 9 which has the exact same main camera sensor as the Redmi Note 7 Pro. I just don't understand why it's not working well for you. But otherwise Arnova's version can take decent photos nonetheless. I think it's a bit better than the versions modded by bulkin043 and BSG when it comes to color reproduction and NightSight.