I cropped Sentinel 1 image in Qgis after doing all the corrections from SNAP. Now I am facing a problem with the image. I got the clipped output and but the problem is that there is an area of black pixels of zero values which is same that of the original product. The rows and columns pixel count appear to be same that of the original product before the clipping.
if you cropped the image by a shapefile in QGIS, make sure you checked this option:
Otherwise the image extents remain the same.
I guess this is the issue. I will try by doing like this.