Hi, Do you have a lot of black margins? Build mask for 0 value. Apply mask and replace 0 by 1 or some thing like this.

You must have a lot of background. You will need to increase the tile size in the Advanced Parameters more if possible but can run into memory allocation issues if you run out of RAM. You could also subset the image and later mosaic the parts together. Lastly, you might try creating a mask of the background and applying the mask, changing the background pixel values to something other than 0 but that is not a valid value in the data.