Legacy ImageMagick Discussions Archive

I have a pretty specific need to mass-process a ton of images in a directory tree. The major problem I'm having is that the source images have, for the most part, different aspect ratios. Why? People did a bunch of silly freehand crops on perfectly good images! Anyway, I would like to batch process as follows:

Crop the source images such that each outputted image will have an aspect ratio of either 4:3 if landscape or 3:4 if portrait losing the minimum number of pixels in the process. I understand that there is no way to accurately know what would make the most pleasing crop from a gravity perspective (starting from the top, left, right, etc.), but I don't care given the large number of photos I'm dealing with in this scenario.

Suggestions are greatly appreciated.

see my scripts, aspect and aspectpad. They may be of help. But you will need to write a wrapper script to traverse your directory tree. My scripts work on one image at a time.

This is great. Here's what I came up with to do my resizing. Also thank you kindly for the emails with those excellent suggestions, and for your scripts.

Code: Select all

#!/bin/bash

if [ ! -d processed_images ]; then
 mkdir processed_images
fi

for PIC in `ls *.{jpg,JPG,jpeg,JPEG}`; do
NAME=`echo ${PIC} | sed 's/.jpg//' | sed 's/.JPG//' | sed 's/.jpeg//' | sed 's/.JPEG//'`
 test=`convert ${PIC} -format "%[fx:(w/h)>=1?1:0]" info:`

 if [ $test -eq 1 ]; then
  echo ${PIC} "is landscape... making thumbnail and image"
  aspect.sh 150x113 -m crop ${PIC} ./processed_images/${NAME}a.jpg
  aspect.sh 600x450 -m crop ${PIC} ./processed_images/${NAME}b.jpg
 else
  echo ${PIC} "is portraitn... making thumbnail and image"
  aspect.sh 113x150 -m crop ${PIC} ./processed_images/${NAME}a.jpg
  aspect.sh 450x600 -m crop ${PIC} ./processed_images/${NAME}b.jpg
 fi
done

Legacy ImageMagick Discussions Archive

need to auto crop

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