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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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# |
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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$$ | pvalue -h -b | rcalc -e '$1=2*$3*cos(wx);$2=2*$3*cos(wy);$3=2*$3*sin(wx);$4=2*$3*sin(wy);$5=4*$3*cos(wx)*cos(wy);$6=4*$3*cos(wx)*sin(wy);$7=4*$3*sin(wx)*cos(wy);$8=4*$3*sin(wx)*sin(wy);' -e 'wx=2*PI/32*$1;wy=2*PI/32*$2' | total -m` |
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pcomb -e 'ro=ri(1)*f;go=gi(1)*f;bo=bi(1)*f;f=1-fc-fs-f0-f1' \ |
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-e "fc=$coef[1]*cos(wx)+$coef[2]*cos(wy)" \ |
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-e "fs=$coef[3]*sin(wx)+$coef[4]*sin(wy)" \ |
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-e "f0=$coef[5]*cos(wx)*cos(wy)+$coef[6]*cos(wx)*sin(wy)" \ |
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-e "f1=$coef[7]*sin(wx)*cos(wy)+$coef[8]*sin(wx)*sin(wy)" \ |
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-e "wx=2*3.1416/$resolu[1]*x;wy=2*3.1416/$resolu[2]*y" \ |
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np$$ > $f |
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rm np$$ |
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end |