As it can be seen, there is banding effect in the background.
Is it something "unavoidable" considering the level of noise, or is it because of something else (bad setting, or i don't know what...).
Original :
Filtered :
Banding Effect
Good thing to ask, it was difficult, but finaly result is that in the preview there is nothing noticeable.
A little banding unavoidable is added by the RGB->YUV, and a little more was added by the fact that i didn't specify at VDub that the file was YUVrec709, so when copying the output to clipboard and creating the RGB BMP, it was converted in rec601, adding another little.
Finaly nothing wrong anywhere, just a display trick, but as the picture was created from the display...
A little banding unavoidable is added by the RGB->YUV, and a little more was added by the fact that i didn't specify at VDub that the file was YUVrec709, so when copying the output to clipboard and creating the RGB BMP, it was converted in rec601, adding another little.
Finaly nothing wrong anywhere, just a display trick, but as the picture was created from the display...