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#!/bin/csh -f |
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# RCSid: $Id: pdelta.csh,v 3.1 2003/02/22 02:07:27 greg Exp $ |
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# |
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# Compute 1976 CIE Lab deltaE* between two Radiance pictures |
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# |
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if ($#argv != 2) then |
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echo "Usage: $0 picture1 picture2 > output.pic" |
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exit 1 |
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endif |
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set cielab='sq(x):x*x;Ls(Yi):if(Yi/Yw-.01,116*(Yi/Yw)^(1/3)-16,903.3*Yi/Yw);as(Xi,Yi,Zi):500*((Xi/Xw)^(1/3)-(Yi/Yw)^(1/3));bs(Xi,Yi,Zi):200*((Yi/Yw)^(1/3)-(Zi/Zw)^(1/3));dE(X1,Y1,Z1,X2,Y2,Z2):sqrt(sq(Ls(Y1)-Ls(Y2))+sq(as(X1,Y1,Z1)-as(X2,Y2,Z2))+sq(bs(X1,Y1,Z1)-bs(X2,Y2,Z2)));' |
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# The following is for Radiance RGB -> XYZ |
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set rgb2xyz='X(R,G,B):92.03*R+57.98*G+28.99*B;Y(R,G,B):47.45*R+119.9*G+11.6*B;Z(R,G,B):4.31*R+21.99*G+152.7*B' |
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# The following is for sRGB -> XYZ |
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# set rgb2xyz='X(R,G,B):73.82*R+64.01*G+32.31*B;Y(R,G,B):38.06*R+128*G+12.92*B;Z(R,G,B):3.46*R+21.34*G+170.15*B' |
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set f1="$1" |
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set inp1='x1=ri(1);y1=gi(1);z1=bi(1)' |
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set f2="$2" |
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set inp2='x2=ri(2);y2=gi(2);z2=bi(2)' |
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if ( "`getinfo < $f1:q | grep '^FORMAT=32-bit_rle_xyze'`" == "" ) then |
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set inp1='x1=X(ri(1),gi(1),bi(1));y1=Y(ri(1),gi(1),bi(1));z1=Z(ri(1),gi(1),bi(1))' |
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endif |
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if ( "`getinfo < $f2:q | grep '^FORMAT=32-bit_rle_xyze'`" == "" ) then |
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set inp2='x2=X(ri(2),gi(2),bi(2));y2=Y(ri(2),gi(2),bi(2));z2=Z(ri(2),gi(2),bi(2))' |
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endif |
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set tempf=`mktemp /tmp/tf.XXXXXX` |
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pfilt -1 -x 128 -y 128 -p 1 $f1:q | pvalue -o -h -H -d > $tempf |
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set wht=(`total -u $tempf`) |
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set avg=`rcalc -e '$1=$2' $tempf | total -m` |
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rm $tempf |
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pcomb -e $cielab:q -e $rgb2xyz:q \ |
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-e "Yw:179*3*$avg; Xw:$wht[1]*Yw/$wht[2]; Zw:$wht[3]*Yw/$wht[2]" \ |
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-e $inp1:q -e $inp2:q -e 'lo=dE(x1,y1,z1,x2,y2,z2)' \ |
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-o $f1:q -o $f2:q |
