For example, I'd like to crop an area in this yellow rectangle in all pictures of same dimensions (same length and width).
One use of this may be to crop a bunch of screenshots taken of a video game or program so that only the relevant parts of the image are there.
You can use irfanview to do this. Once you have it installed, open a command prompt, go to irfanview program folder, then convert your images with a command like this:
i_view64.exe c:\images\*.jpg /crop=(0,0,500,500,0) /convert=c:\output\*.jpg
The 5 numbers in the parenthesis are
you'll have to find these numbers yourself. Once you have the numbers figured out, you can crop all your images with the command above in one go.
Or if you prefer graphical user interface instead of command line, you can open up one of your images using irfarview, press b to batch crop/convert your files. you can find crop options by advanced button.
You can use the well known free and open-source ImageMagick
Simple example from the documentation:
convert rose: -crop 40x30+10+10 crop.gif
Where 40x30+10+10 is the geometry, basically meaning width x height + offsetX + offsetY. All in pixels. Offset is measured from top left corner. Note that there should be no spaces between the numbers and the x and + signs. I'm adding spaces here for readability.
To run that for a batch of images, you could use OS completion and expansion commands depending on which system you're on. In Windows command prompt for example:
for %f in (*.png) do (
convert %f -crop 40x30+10+10 cropped_%f
)
In PowerShell:
gci *.png | %{ convert -crop 40x30+10+10 $_.FullName ($_.BaseName+"_crop"+$_.Extension)}
And in Bash:
images=$(ls -1 *.png)
for image in $images ; do
convert -crop 40x30+10+10 cropped_$image
done
If you want to recurse through all sub-directories, use:
images=$(find -type f -name '*.png')
https://www.thewindowsclub.com/free-image-splitter-software-for-windows
I used 2] and 4] for splitting large maps or satellite images.
