Extends img with a lomo command. Requires imagemagick to generate a mask then adjusts and composes the final image with img.

img-lomo

#!/usr/bin/env sh

function usage {
  echo "lomo [options]"
}

function short {
  echo "applies a simple lomo effect to the image."
}

function long {
  echo "  Applies a simple lomo effect to the image, boosting its saturation and
  composing with a black edged mask."
}

case "$1" in
  --usage ) usage
    exit
    ;;
  --short ) short
    exit
    ;;
  --long ) long
    exit
    ;;
esac

# Using the method described on:
# http://the.taoofmac.com/space/blog/2005/08/23/2359

# generate a mask using imagemagick
convert -size 80x60 xc:black \
        -fill white -draw 'rectangle 1,1 78,58' \
        -gaussian 7x15 +matte lomo_mask.png
mogrify -resize 800x600 -gaussian 0x5 lomo_mask.png

# then put it together with img
(
  img contrast --ratio 1.2 |
  img saturation --ratio 1.2 |
  img blend --multiply --fit lomo_mask.png
)

# delete the mask
rm lomo_mask.png