Resize images to fixed size with padding

Resize images and add padding in background color to get a fixed image size for Grav blog header image using ImageMagick

How to use (Linux)

1. install ImageMagick (eg. https://linuxopsys.com/topics/install-latest-imagemagick-on-ubuntu-20-04)
2. copy resizepad.sh to your user folder and run it with the image filename as argument

Run the script to resize an image in the same folder:

sh resizepad.sh image.jpg

You can use the bash script in Ubuntu WSL terminal to resize an image in your windows user Downloads folder:

sh resizepad.sh /mnt/c/Users/aleskl/Downloads/image.jpg

Edit the size variable for different image size

size="960x400"

Edit the convert argument -background for background padding colour

convert "$1" -resize $size -background white -gravity center -extent $size "${filename}_${size}.${extension}"

How to use (Windows)

1. install ImageMagick (https://imagemagick.org/script/download.php#windows)
2. copy resizepad.bat to your user folder and run it with the image filename as argument

Run the batch script in Windows Terminal (Command Prompt) to resize an image in the same folder:

resizepad.bat image.jpg

Edit the size and convert variables for different image size and background padding colour as above

References

https://superuser.com/questions/1358715/how-do-i-resize-and-pad-an-image-to-a-given-size-using-imagemagick https://stackoverflow.com/questions/965053/extract-filename-and-extension-in-bash