scripts/cvt.sh

   1 #!/bin/sh
   2 if [ -z "$1" ]; then
   3         echo "$0 <filename>"
   4         echo "The output is <filename>_thumb.png"
   5         exit
   6 fi
   7
   8 CONVERT="/home/roberto/RNF/ImageMagick/bin/convert"
   9
  10 #-- Source file without extension
  11 SOURCE_NAME=`basename $1 | awk -F. -v OFS=. '{$NF=""; sub("[.]$", ""); print}'`
  12
  13
  14 #-- Output Thumbnail
  15 THUMB_OUT="${SOURCE_NAME}_final.png"
  16
  17 #-- Resized Thumbnail
  18 THUMB_RESIZED="${SOURCE_NAME}_thumb_resized.png"
  19 THUMB_SRC="${SOURCE_NAME}_thumb.png"
  20
  21 #-- Resized Thumbnail Mask
  22 THUMB_MSK="${SOURCE_NAME}_thumb_msk.png"
  23
  24 #-- Resized Thumbnail Lighting Overlay
  25 THUMB_OVR="${SOURCE_NAME}_thumb_ovr.png"
  26
  27 #-- Resize then crop off the parts of the image that overflows the desired size.
  28 #$CONVERT $1 -thumbnail 100x100^ -gravity center -extent 100x100 ${THUMB_SRC}
  29 #$CONVERT $1 -resize 100x100^ -gravity center -extent 100x100 ${THUMB_SRC}
  30 #$CONVERT $1 -resize 48x48^ -gravity center -extent 48x48 ${THUMB_SRC}
  31 $CONVERT $1 -resize 32x32^ -gravity center ${THUMB_RESIZED}
  32
  33 $CONVERT ${THUMB_RESIZED} -gravity center -extent 48x48 ${THUMB_SRC}
  34
  35 #-- For lets generate a rounded corners mask for our thumbnail image.
  36 #$CONVERT ${THUMB_SRC} -alpha off -fill white -colorize 100% \
  37 #     -draw 'fill black polygon 0,0 0,15 15,0 fill white circle 15,15 15,0' \
  38 #     \( +clone -flip \) -compose Multiply -composite \
  39 #     \( +clone -flop \) -compose Multiply -composite \
  40 #     -background Gray50 -alpha Shape ${THUMB_MSK}
  41
  42 #-- For lets generate a rounded corners mask for our thumbnail image.
  43 $CONVERT ${THUMB_SRC} -alpha off -fill white -colorize 100% \
  44      -draw 'fill black polygon 0,0 0,7 7,0 fill white circle 7,7 7,0' \
  45      \( +clone -flip \) -compose Multiply -composite \
  46      \( +clone -flop \) -compose Multiply -composite \
  47      -background Gray50 -alpha Shape ${THUMB_MSK}
  48
  49 #-- Now we have a 'shape mask' we want to use, I can apply the Aqua Effect
  50 #-- effect to generate a lighting overlay, for this shape.
  51
  52 $CONVERT ${THUMB_MSK} -bordercolor None -border 1x1 \
  53           -alpha Extract -blur 0x10  -shade 130x30 -alpha On \
  54           -background gray50 -alpha background -auto-level \
  55           -function polynomial  3.5,-5.05,2.05,0.3 \
  56           \( +clone -alpha extract  -blur 0x2 \) \
  57           -channel RGB -compose multiply -composite \
  58           +channel +compose -chop 1x1 ${THUMB_OVR}
  59
  60 #-- With a final light/shade overlay image such as the above we can easily
  61 #-- apply it to any thumbnail image of the right size.
  62
  63 $CONVERT ${THUMB_SRC} ${THUMB_OVR} \( -clone 0,1 -compose Hardlight -composite \) \
  64           -delete 0 -compose In -composite ${THUMB_OUT}
  65
  66 #-- Remove intermediate files
  67 rm $THUMB_SRC
  68 rm $THUMB_MSK
  69 rm $THUMB_OVR
  70
  71
  72