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#!/bin/bash

## convert (essentially from AdobeRGB or CMYK) to sRGB jpg
## and optionally resize


# paths to profile files
srgb=/docs/photos/icc/sRGB.icm
cmyk=/docs/photos/icc/USWebCoatedSWOP.icc

# defaults
outdir=.
debug=

# read options
while getopts "dvho:s:a:" opt
do
  case $opt in
    "d|v" ) debug=1;; # verbose is same as debug for now
    "s"   ) size=$OPTARG;;
    "o"   ) outdir=$OPTARG;;
    "a"   ) add_options=$OPTARG;;
    "h"   ) cat <<END_HELP;
Usage: $0 [options] FILE [FILE...]
Options:
    -h                   Print this help
    -d                   Print debugging info while processing
    -v                   Be verbose (same as -d for now)
    -s nnn[xhhh]    Specify new width in pixels or new size as widthxheight (ie -w 640x480)
    -a "im options" Additional options for IM
    -o dir              Output directory
END_HELP
            exit 0;;
  esac
done

shift $(($OPTIND - 1))

if [ -n "$size" ]; then
	resize="-resize $size"
else
	resize=
fi

shopt -s nullglob
for f in "$@"
do
	# skip if not jpeg or tiff
	#[[ "$f" =~ '\.(jpe?g|tiff?)$' ]] || continue

	dir=$(dirname "$f")
	name=$(basename "$f")
	base=${name%.*}

	profile="/tmp/$base.icc"

	out="$outdir/$base-x$size.jpg"

	# extract possible color profile
	[ -n "$debug" ] && echo "    extracting profile $f"
	convert "$f" "$profile" 2>/dev/null

	[ -n "$debug" ] && echo "    resize = $resize"

	if [ -s "$profile" ]; then
		# we have an embedded profile, so ImageMagick will use that anyway
		[ -n "$debug" ] && echo "    convert with embedded profile $f"
		convert "$f" -profile "$srgb" +profile '*' $resize $add_options "$out" \
		&& echo -e "\tOK $out"
	else
		# no embedded profile in source
		if identify -format "%r" "$f" | grep CMYK >/dev/null ; then
			# CMYK file without embedded profile
			[ -n "$debug" ] && echo "    convert cmyk without embedded profile $f"
			convert "$f" -profile "$cmyk" -profile "$srgb" +profile '*' $resize $add_options "$out" \
			&& echo -e "\tOK $out"
			# alternative would be
			#convert "$f" -colorspace RGB -resize $size "$out"
		else
			# No profile and not CMYK. Probably already in RGB. Just resize
			[ -n "$debug" ] && echo "    resizing only $f"
			convert "$f" $resize $add_options "$out" \
			&& echo -e "\tOK $out"
		fi
	fi
	[ -f "$profile" ] && rm "$profile"
done