Since years this script was waiting for release,
now check the internal structure of your pictures!
For example little endian dump of a BMP header.

Changes
WebP support
Exif support
BMP support
MUICON compatible

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  584    1274  45.8% -lh5- 7c14 Jul 24 01:18 chkpic.rexx
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         1 file      584    1274  45.8%            Jul 25 20:49