How to crop image from center without resizing with imagemagick

Question

for parentDir in *
do
    cd "$parentDir"
    for subDir in *
    do
        cd "$subDir"
        for file in *.*
        do
            convert "$file" -crop 120x95 summary_"$file"
            convert "$file" -crop 160x225 detail_"$file"
        done
        mkdir detail
        mkdir summary
        mv summary_* summary/
        mv detail_* detail/
        cd ..
    done
cd ..
done

Here is my script, I need a way to crop the image without resizing, get rid of the extra surrounding.

For example: 1200* 1500 image ----> 120px * 90px from the center

Answer 1

If you are just trying to crop each image to one center part then use

convert input.suffix -gravity center -crop WxH+0+0 +repage output.suffix

Otherwise, you will get many WxH crops for each image.

Answer 2

Thanks to @fmw42 I've made this script to use with my file manager Dolphin, which can be adapted for others as well:

#!/usr/bin/env bash
# DEPENDS: imagemagick (inc. convert)
OLDIFS=$IFS
IFS="
"
# Get dimensions
WH="$(kdialog --title "Image Dimensions" --inputbox "Enter image width and height - e.g. 300x400:")"
# If no name was provided
if [ -z $WH ]
then
    exit 1
fi
for filename in "${@}"
do
    name=${filename%.*}
    ext=${filename##*.}
    convert "$filename" -gravity center -crop $WH+0+0 +repage "${name}"_cropped."${ext}"
done
IFS=$OLDIFS