Ubuntu – How to batch-process images to adjust contrast in terminal

Easy. Install imagemagick:

sudo apt-get install imagemagick

Its simplest usage is:

convert File.tif File.jpg

It is smart and goes by your file extension.

Now, for doing batch conversions, we shall use a loop.

cd into the directory where your tif files are.

then:

for f in *.tif; do  echo "Converting $f"; convert "$f"  "$(basename "$f" .tif).jpg"; done

Read also as:

for f in *.tif
do  
    echo "Converting $f" 
    convert "$f"  "$(basename "$f" .tif).jpg" 
done

That should do it!

Also, once you convert all of the files and verify the new jpg's integrity, just run rm *.tif in that directory to delete all your old .tif files. Be careful with asterisks though, don't add a space after the *, or you will delete all your files in the directory.

Tip: If you have a folder with subfolders that holds these images. You could use this for loop to find all .TIF files within that folder:

for f in $(find -name *.tif); do ...; done

for f in $(find . -iname "*.jpg" -type f) ;
    do
    convert $f $(dirname $f)/$(basename -s .jpg $f).png ;
    done

• find . -iname "*.jpg" -type f : search for file ending with ".jpg" case insensitive
• $(dirname $f) : relative path to the folder containing file $f
• $(basename -s .jpg $f) : filename without the suffix ".jpg"

In old Ubuntu basename may need to be run with different way:

basename $f .jpg

Convert is a part of imagemagick (As reference see Batch Processing tif images: Converting .tif to .jpeg) , to install

sudo apt-get install imagemagick