By default, projects open in 8-bits per channel (bpc). For "Extra Quality" results without color banding (especially in gradients), change your project color depth:
This feature analyzes frames before and after a blurry shot to restore lost sharpness caused by unwanted camera movement. It works perfectly alongside the Warp Stabilizer VFX tool to salvage shaky, low-quality footage. Optimizing for Extra Quality and Performance adobe after effects cc 2017 1421 extra quality
Fixed rendering issues for the effect when working above 8bpc. By default, projects open in 8-bits per channel (bpc)