Camera tether -- error correcting time

mike acker · 10-31-2015, 05:18 AM

if I tether my camera to my 'Nix box the Nix box subtracts 4 hours from the time on the images as they are transferred

e.g if the time on the chip -- and in the EXIF -- is 1307 -- when the image is stored in 'Nix it is changed to 0907

the EXIF data is not changed; only the time on the file directory entry

Code:

Tether:

-rw-r--r-- 1 mike mike 11235586 2015-10-29 09:07:14.000000000 -0400 VM2A3123.JPG

it appears the 'Nix box (LMDE2/Debian) *thinks* the camera data is at UTC -- and attempts to correct it to local time

any clues on correcting this ?

if i read the camera chip directly instead of using the tether the times all come across correct.

mike acker · 10-31-2015, 10:32 AM

Code:

#!/bin/sh
#
# reset jpeg file by 4 hours
#
echo "correct *.JPG time stamps.   Enter hours, e.g. +4 for UTC to EDT"
read hrs_adj
echo "Adjustment will be " $hrs_adj " hours. "

read -p "Enter name of directory to be corrected" directory_name

echo "Directory name: " $directory_name

 for file_nm in "$directory_name"/*.JPG
  do
    echo "File name to touch: " "$file_nm"  
    # to increment time stamp relative to subject file
    touch -r "$file_nm" -d " $hrs_adj hour " "$file_nm"
  done
  
  echo "Corrected Directory:"
  ls -l "$directory_name"

echo "done"