PreparePhotos.sh

#!/bin/bash
#

#declare changeable parameters
PHOTO_INPUT_DIR="Watermark_Test/Photos"
POST_CATEGORY="Watermark_Test"
POST_NAME="WatermarkedPhotos"
WATERMARK="Watermark_Test/Watermark/Watermark.png"
SIZED_WATERMARK="Watermark_Test/Watermark/SIZED_WATERMARK.png"
COMPRESSION_FACTOR="70"

# create output directory
PHOTO_OUTPUT_DIR="${POST_CATEGORY}/${POST_NAME}"
mkdir -p ${PHOTO_OUTPUT_DIR}

# loop over all images to prepare them bevor upload
for FILE_NAME in ${PHOTO_INPUT_DIR}/*.*; do
  if [ ${FILE_NAME##*.} == "JPG" ]  || [ ${FILE_NAME##*.} == "jpg" ] || [ ${FILE_NAME##*.} == "png" ]; then
    # cut of path and extension
    FILE_WITH_EXTENSION="$(basename -- ${FILE_NAME})"
    FILE=${FILE_WITH_EXTENSION%.*}

    OUTPUT_FILE_NAME="${FILE}-WM.jpg"
    OUTPUT_FILE_NAME_COMPRESSED="windsurf-stormy-stories-surf-travel-blog-${POST_CATEGORY}-${POST_NAME}-WM-${COMPRESSION_FACTOR}p-${FILE}.jpg"

    # check if the converted image already exists
    if ! [ -f "${PHOTO_OUTPUT_DIR}/${OUTPUT_FILE_NAME_COMPRESSED}" ]; then

      # calculate a vector to resize the watermark depending in the image size and finaly resize the watermark
      VARIABLE_HEIGHT=$(identify -ping -format '%h' ${PHOTO_INPUT_DIR}/${FILE_WITH_EXTENSION} )
      VARIABLE_WIDTH=$(identify -ping -format '%w' ${PHOTO_INPUT_DIR}/${FILE_WITH_EXTENSION} )
      #ImageSize=$((${VARIABLE_HEIGHT}*${VARIABLE_WIDTH})) ?? Version 0.3.0  calculate a vector for panorama pictures
      #Vector="$(bc -l <<< "($ImageSize / 20256000)*100")%"

      # check if resize is nessesary
      if ! [ ${REMEMBERED_iMAGE_SIZE} == ${VARIABLE_WIDTH} ]; then
        VECTOR="$(bc -l <<< "($VARIABLE_WIDTH / 6000)*100")%"
        convert ${WATERMARK} -resize ${VECTOR} ${SIZED_WATERMARK}
        REMEMBERED_iMAGE_SIZE=${VARIABLE_WIDTH}
      fi
      
      # watermark the image
      composite -gravity SouthWest -geometry +10+10   ${SIZED_WATERMARK} ${PHOTO_INPUT_DIR}/${FILE_WITH_EXTENSION} "${PHOTO_OUTPUT_DIR}/${OUTPUT_FILE_NAME}"

      # erase the metadata out of the image
      jhead -purejpg "${PHOTO_OUTPUT_DIR}/${OUTPUT_FILE_NAME}"

      # compress the image
      convert "${PHOTO_OUTPUT_DIR}/${OUTPUT_FILE_NAME}" -quality "${COMPRESSION_FACTOR}%" "${PHOTO_OUTPUT_DIR}/${OUTPUT_FILE_NAME_COMPRESSED}"

      echo "Finished Image "${OUTPUT_FILE_NAME_COMPRESSED}
    else
      echo "Image ${FILE_NAME} already converted"
    fi
  fi
done;