Modify Multiple Images From Console

Question

I know convert changes from a image format to another. mogrify can resize and scale multiple images also. But HOW can i modify all images inside a directory, including the sub-directories. Like for example change every image inside a folder and its sub-folders from one format png to another format jpg.

Or resize all pictures in a folder and its sub-folders to a desire one.

Answer 1

Since mogrify accepts a list of files, separated by line breaks, you can do this:

mogrify -equalize $(find -iname '*.png')

I use equalize as an example, but the important bit is the last one.

• The file name can be any expression that prints out a list of files, i use find -iname '*.png' as an example. You can play around with the find command until it give you the list of files you want.

It's important that whatever command you put in $() returns a list of files with their correct path. ls -Ra will just return the file name. The output of find | grep png on the other hand looks like this:

./Webcam/lenovo-maverick-20110101-1.png
./lenovo-maverick-20110101-2.png
./lenovo-maverick-20110101-1.png

Where . means "the current working directory".