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#!/bin/csh -f |
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# SCCSid "$SunId$ LBL" |
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# |
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# Normalize a picture to make it suitable as a tiling pattern. |
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# This script reduces the image and removes the lowest frequencies. |
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# Normalize a pattern for tiling (-b option blends edges) by removing |
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# lowest frequencies from image and reducing to standard size (-r option) |
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# |
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set pf="pfilt -e 2" |
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while ($#argv > 0) |
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switch ($argv[1]) |
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case -r: |
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shift argv |
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set pf="$pf -x $argv[1] -y $argv[1] -p 1" |
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breaksw |
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case -b: |
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set blend |
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breaksw |
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case -*: |
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echo bad option $argv[1] |
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exit 1 |
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default: |
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goto dofiles |
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endsw |
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shift argv |
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end |
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dofiles: |
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onintr quit |
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set td=/usr/tmp/np$$ |
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mkdir $td |
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set ha=$0 |
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set ha=$ha:t |
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if ( $?blend ) then |
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set ha="$ha -b" |
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else |
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mknod $td/hf p |
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endif |
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foreach f ($*) |
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pfilt -e 2 -x 128 -y 128 -p 1 $f > np$$ |
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set resolu=`getinfo -d < np$$ | sed 's/-Y \([0-9]*\) +X \([0-9]*\)/\2 \1/'` |
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set coef=`pfilt -1 -x 32 -y 32 np$$ | pvalue -h -b | rcalc -e '$1=2*$3*cos(wx);$2=2*$3*cos(wy);$3=2*$3*sin(wx);$4=2*$3*sin(wy);$5=4*$3*cos(wx)*cos(wy);$6=4*$3*cos(wx)*sin(wy);$7=4*$3*sin(wx)*cos(wy);$8=4*$3*sin(wx)*sin(wy);' -e 'wx=2*PI/32*$1;wy=2*PI/32*$2' | total -m` |
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echo $f\: |
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echo adjusting size/exposure... |
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$pf $f > $td/pf |
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getinfo < $td/pf > $f |
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ed - $f << _EOF_ |
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i |
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$ha |
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. |
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w |
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q |
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_EOF_ |
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if ( ! $?blend ) then |
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getinfo - < $td/hf >> $f & |
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endif |
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set resolu=`getinfo -d < $td/pf | sed 's/-Y \([0-9]*\) +X \([0-9]*\)/\2 \1/'` |
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echo computing Fourier coefficients... |
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set coef=`pfilt -1 -x 32 -y 32 $td/pf | pvalue -h -b | rcalc -e '$1=2*$3*cos(wx);$2=2*$3*cos(wy);$3=2*$3*sin(wx);$4=2*$3*sin(wy);$5=4*$3*cos(wx)*cos(wy);$6=4*$3*cos(wx)*sin(wy);$7=4*$3*sin(wx)*cos(wy);$8=4*$3*sin(wx)*sin(wy);' -e 'wx=2*PI/32*$1;wy=2*PI/32*$2' | total -m` |
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echo "cosx cosy sinx siny" |
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echo $coef[1-4] |
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echo "cosx*cosy cosx*siny sinx*cosy sinx*siny" |
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echo $coef[5-8] |
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echo removing low frequencies... |
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pcomb -e 'ro=ri(1)*f;go=gi(1)*f;bo=bi(1)*f;f=1-fc-fs-f0-f1' \ |
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-e "fc=$coef[1]*cos(wx)+$coef[2]*cos(wy)" \ |
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-e "fs=$coef[3]*sin(wx)+$coef[4]*sin(wy)" \ |
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-e "f0=$coef[5]*cos(wx)*cos(wy)+$coef[6]*cos(wx)*sin(wy)" \ |
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-e "f1=$coef[7]*sin(wx)*cos(wy)+$coef[8]*sin(wx)*sin(wy)" \ |
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-e "wx=2*3.1416/$resolu[1]*x;wy=2*3.1416/$resolu[2]*y" \ |
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np$$ > $f |
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rm np$$ |
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$td/pf > $td/hf |
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if ( $?blend ) then |
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echo blending edges... |
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@ mar= $resolu[1] - 3 |
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pcompos -x 3 $td/hf 0 0 > $td/left |
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pcompos $td/hf -$mar 0 > $td/right |
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pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \ |
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-e 'f(p)=(3-x)/7*p(1)+(4+x)/7*p(2)' \ |
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$td/right $td/left > $td/left.patch |
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pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \ |
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-e 'f(p)=(1+x)/7*p(1)+(6-x)/7*p(2)' \ |
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$td/left $td/right > $td/right.patch |
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pcompos $td/hf 0 0 $td/left.patch 0 0 $td/right.patch $mar 0 \ |
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> $td/hflr |
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@ mar= $resolu[2] - 3 |
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pcompos -y 3 $td/hflr 0 0 > $td/bottom |
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pcompos $td/hflr 0 -$mar > $td/top |
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pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \ |
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-e 'f(p)=(3-y)/7*p(1)+(4+y)/7*p(2)' \ |
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$td/top $td/bottom > $td/bottom.patch |
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pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \ |
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-e 'f(p)=(1+y)/7*p(1)+(6-y)/7*p(2)' \ |
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$td/bottom $td/top > $td/top.patch |
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pcompos $td/hflr 0 0 $td/bottom.patch 0 0 $td/top.patch 0 $mar \ |
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| getinfo - >> $f |
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endif |
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echo $f done. |
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end |
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quit: |
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rm -rf $td |
