I am learning how to process images using a dedicated astronomy camera. I tried recording a Jupiter video in RAW format. RAW needs to be reconstructed to form color images in a process called debayering. When debayering, select the correct matrix for your camera (RGGB in an ASI 533). If your images still show the bayer (grid) pattern even after debayering, try other configurations such as GBRG or GRBG and see if it removes the artifact (the capture software may have recorded with the incorrect bayer configuration).