pishrink reports 'ERROR: Image already shrunk to smallest size'

[kle99]

Win32DiskImager reads SD-Card-Images to File. The image file is as large as the SD-Card.

History: I installed some packages and forgot to expand the filesystem.
pishrink reports error 'Image already shrunk to smallest size' but the file size is 8GB.
Problem: the image size is smaller than the file size.

pishrink runs on host raspberrypi5, raspi model RPi 3B.
SD-Card of the image is plugged in host raspberrypi4, raspi model 2B.

pishrink console output:
root@raspberrypi5:~# ./pishrink.sh /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r.img /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r-pishrink.img
Copying /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r.img to /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r-pishrink.img...
Creating new /etc/rc.local
/dev/loop0: 143409/391680 files (0.1% non-contiguous), 1125611/1552816 blocks
resize2fs 1.42.12 (29-Aug-2014)
ERROR: Image already shrunk to smallest size

but file size is larger than the image size:
root@raspberrypi5:~# ls -l /mnt/ntfs/pishrink/*img
-rwxrwxrwx 2 pi pi 7994972160 Feb 6 11:48 /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r.img
-rwxrwxrwx 1 pi pi 7994972160 Feb 7 14:03 /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r-pishrink.img

Linux command parted reports:
root@raspberrypi5:~# parted -s /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r-pishrink.img print
Model: (file)
Disk /mnt/ntfs/pishrink/2018-02-06-jessie-3.5-adafruit-peppy--2016-11-08-pitft-35r-pishrink.img: 7995MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 4194kB 70.3MB 66.1MB primary fat16 lba
2 70.3MB 6431MB 6360MB primary ext4

Disk file size is 7995MB
Partition End is 6431MB

[Drewsif]

Closing as a duplicate of #80. Looking into it though