Difference between revisions of "Image Resizing"

#!/bin/bash
 
YEAR=$(date +%Y)
MONTH=$(date +%m)
DIR=/imc/mir/mayday/images/$YEAR/$MONTH
 
echo "$DIR IN_CLOSE_WRITE /usr/local/bin/exif-strip-resize \$@ \$#" > /etc/incron.d/mayday.conf

0 0 1 * * /usr/local/bin/incron-update ; /etc/init.d/incron restart

#!/bin/bash
 
# this script takes the full path to a jpeg file 
# and the filename, paased from incrond
# it scale big ones and also remove all exif metadata
# from the jpeg
 
# sub-directory for sacled images
SCALED=scaled
 
# check for the first command line argument
if [[ $1 ]]; then
  # check it's a directory
  if [[ -d $1 ]]; then
    DIR=$1
  else
    echo "$1 isn't a directory"
    exit
  fi
else
  echo "You need to specify the path to a file as the first argument" 
  exit
fi
 
# make a directory for the scaled images
if [[ -d $DIR/$SCALED ]]; then
  echo $DIR/$SCALED exists
else
  mkdir $DIR/$SCALED
fi
 
if [[ $2 ]]; then
  FILE=$2
  echo file is $DIR/$FILE
  # check the file exists
  if [[ -f $DIR/$FILE ]]; then
    # check if it's really a jpg
    TYPE=$(file -bi $DIR/$FILE)
    if [[ $TYPE = "image/jpeg; charset=binary" ]]; then
 
      # remove exif metadata preserving the image date
      DATE=$(date -r $DIR/$FILE)
      exiv2 rm "$DIR/$FILE"
 
      # check is a sub-directory for scaled images is writable 
      if [[ -w $DIR/$SCALED ]]; then
 
        # generate scaled versions of images if they are greater than 640px wide 
        # or 1024px high, maintaining the aspect ratio
        WIDTH=$(identify -format %w $DIR/$FILE)
 
        if [[ $WIDTH -gt 640 ]]; then
           convert "$DIR/$FILE" -resize 640x1024 -format jpeg -quality 80 "$DIR/$SCALED/$FILE"
           touch -d "$DATE" "$DIR/$SCALED/$FILE"
        fi
 
        # reset the file date
        touch -d "$DATE" "$DIR/$SCALED/$FILE"
 
      else
        echo $DIR/$SCALED is not writable
      fi
    else
      echo "$DIR/$FILE is not a jpeg"
    fi
  else
    echo "$DIR/$FILE does not exist"
  fi
else
  echo "$DIR/$FILE isn't a file"
fi

#!/bin/bash
 
# this script takes a directory with some jpeg files in and 
# will scale the big ones and also remove all exif metadata
# from the jpegs
 
# you can set an optional AGE vairable here, if it's set then only 
# files that are newer than AGE will be looked at -- this is handy 
# if the script is running on a cron job, set it to a tile just longer
# than the cron interval, use mins for the value  
 
AGE=200
 
# Directory of images is passed to this script via $1, if it's 
# not then we assume that we should run in the current directory.
if [[ $1 ]]; then
  # change to the directory where the images are
  cd $1
  DIR=$(pwd)
else
  DIR=$(pwd)
fi
 
 
# get a list of the files, omitting ones that have already been scaled
if [[ $AGE ]]; then
  FILES=$(find -P $DIR -type f -cmin -$AGE -name '*.jpg' ! -name '*\.indyscaled\.jpg')
else
  FILES=$(find -P $DIR -type f -name '*.jpg' ! -name '*\.indyscaled\.jpg')
fi
 
for file in $FILES; do
#echo file: $file
 
  # check the file exists
  if [[ -f $file ]]; then
 
    # check if we can write to the file
    if [[ -w $file ]]; then
 
      # check if it's really a jpg
      TYPE=$(file -bi $file)
      if [[ $TYPE = "image/jpeg; charset=binary" ]]; then
 
         # remove exif metadata preserving the image date
         DATE=$(date -r $file)
         exiv2 rm "$file"
 
         # generate scaled versions of images if they are greater than 640px wide 
         # or 1024px high, maintaining the aspect ratio
         WIDTH=$(identify -format %w $file)
         if [[ $WIDTH -gt 640 ]]; then
            echo scalling $file
            convert "$file" -resize 640x1024 -format jpeg -quality 80 "$file.indyscaled.jpg"
            touch -d "$DATE" "$file.indyscaled.jpg"
         fi
 
         # reset the file date
         touch -d "$DATE" "$file"
 
      else
 
        echo $file is not a jpeg
 
      fi
 
    else
 
      echo $file is not writable
 
    fi
 
  else
 
    echo $file does not exist 
 
  fi
 
done