when working on bigger files, (like 10.000 pixels or more). Come up some kind of "steps" in the blur.
I hear about, working on 16bits ou 32bits image file or aply a noise over the image.
What do you guys could talk about that? Working on 32bits image file could solve this?
Banding is impossible to avoid. Even if you work in 16bpc or 32bpc it wil lcome back once you save to an 8bpc format like JPEG. Simple math - any distance larger than 1024 pixels will require pixels of the same color to be duplicated simply because there are no more "levels" for smooth gradations and you see that as banding. Specific color settings and color profiles e.g. as used for print may further reduce the available headroom for quantization. Yes, tricks like dithering with extra noise patterns and playing around with blurs may improve perception, but they can only take you so far. that is to say: You will have to live with it and adapt your workflows and even change designs to not produce such critical areas.