#
# emu-ivcc-ALL.sh - apply all 5 color corrections for src.png, to get dst.png
#
	#
	# prepare misc
	#
BRI=-10		# brightness
CON=40		# contrast
GAM=1.30	# gamma
SAT=-30		# saturation
CB_R=20		# color balance: R
CB_G=10		# color balance: G
CB_B=-10	# color balance: B

PPM="ppm-chain"
TMP="ppm-tmp"
TRUE="1"

	#
	# start corrections
	#
pngtopnm src.png | ppmtoppm > $PPM

	#
	# [1] Brightness
	# [2] Contrast
	#
if [ 1 = $TRUE ]; then
	awk -v gen_map=1 -v b=$BRI -v c=$CON -f v-emu-ivcc.awk \
	| pgmtoppm white > c-map.ppm

	cat $PPM | ppmtorgb3
	pgmtoppm -map c-map.ppm noname.red | ppmtopgm > $TMP.red
	pgmtoppm -map c-map.ppm noname.grn | ppmtopgm > $TMP.grn
	pgmtoppm -map c-map.ppm noname.blu | ppmtopgm > $TMP.blu
	rm            c-map.ppm noname.???
	rgb3toppm $TMP.red $TMP.grn $TMP.blu > $PPM
	rm        $TMP.red $TMP.grn $TMP.blu
fi

	#
	# [3] Gammma correction
	#
if [ 1 = $TRUE ]; then
	pnmgamma $GAM $PPM > $TMP
	mv                   $TMP $PPM
fi

	#
	# [4] Saturation
	#
if [ 1 = $TRUE ]; then
	cat $PPM | ppmtoppm -plain | awk -v sat=$SAT -f v-emu-ivsat.awk \
	| ppmtoppm > $TMP
	mv           $TMP $PPM
fi

	#
	# [5] Color-balance
	#
if [ 1 = $TRUE ]; then
	cat $PPM | ppmtorgb3
	pamfunc -add $CB_R noname.red > $TMP.red
	pamfunc -add $CB_G noname.grn > $TMP.grn
	pamfunc -add $CB_B noname.blu > $TMP.blu
	rm                 noname.???
	rgb3toppm $TMP.red $TMP.grn $TMP.blu > $PPM
	rm        $TMP.red $TMP.grn $TMP.blu
fi

	#
	# finish
	#
pnmtopng  $PPM > dst.png
rm        $PPM