Batch processing of photos on post-editing

[rich2005]

Quote:There are other Open Source command-line graphic tools for Linux, such as;

GraphicsMagick Image Processing System http://www.graphicsmagick.org/
Scrot https://github.com/dreamer/scrot
Feh https://feh.finalrewind.org/
Exiv2 https://exiv2.org/
Do you have experience running them?

That is a real mixture, I can not remember which came first, I think GM before IM but they are forks of the same. You do not need both, stick with IM. Scrot I have used for capturing time-lapse frames the others ??? but if you are looking for a command line viewer then IM has the display function.

Quote:....but the brightness and contrast look completely different viewed on Image Views. I don't know why? ...I have to adjust their values blindlessly.

I think you are asking a graphics appliction to make decisions for you. Each negative is going to be different and need your attention, batch is for running through a list without intervention.

However as a starting point for *you* to improve on. Assuming all images are jpeg

Code:

#!/bin/bash
  find . -name "*.jpg" | while read fname ; do
     echo "Doing:  $fname"
     convert -negate -brightness-contrast 23x56 "$fname" temp.png
     display -resize 500x500 temp.png
     read -p "Press any key to continue... "
     echo "Press the space bar..."
     rm temp.png
     convert "$fname" -negate -brightness-contrast 23x56 "${fname%%jpg}png"
    
  done

Put that in the folder with your images and run it in a terminal so you can answer the "press any key..."

Using Ubuntu 20.04 and Gimp 2.10.18 ? Probably a stock Gimp that comes without python support so Ofnuts plugins are out. Gmic does provide a decent preview and filter values saved for future use, but it is a one-by-one plugin (unless used with bimp, back to the no-preview scenario)

best of luck...