How can I apply auto-levels to a series of photographs, with each photo considered separately?

Question

I'm working on a set of photos that I want to enhance automatically. I used an action that I created by my self using the levels option of PS. Yet every single photo has its own histogram so when I perform the action on a whole folder the results are not pretty much convincing.

I am wondering if there is any tool that allows you to enhance automatically a directory of photos and taking in consideration the properties of each one.

Answer 1

You can use ImageMagick with the auto-level or level flags.

convert input.jpg -auto-level output.jpg
convert input.jpg -level 1%,99% output.jpg

On Linux or Mac, you can use a bash control structure to perform the operation on multiple image files.

for f in *.jpg ; do
   convert "$f" -level 1%,99% "${f%.jpg}-level.jpg"
done

For Windows, you can install a bash shell, like Cygwin or Windows Subsystem for Linux.

Anyone who knows the native cmd or PowerShell commands for Windows, feel free to edit to add.