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.SH EXAMPLES |
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To produce a picture showing the difference between pic1 and pic2: |
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|
.IP "" .2i |
| 201 |
< |
pcomb -e 'ro=ri(1)-ri(2);go=gi(1)-gi(2);bo=bi(1)-bi(2)' pic1 pic2 > diff |
| 201 |
> |
pcomb \-e 'ro=ri(1)\-ri(2);go=gi(1)\-gi(2);bo=bi(1)\-bi(2)' pic1 pic2 > diff |
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|
.PP |
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Or, more efficiently: |
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|
.IP "" .2i |
| 205 |
< |
pcomb pic1 -s -1 pic2 > diff |
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> |
pcomb pic1 \-s \-1 pic2 > diff |
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|
.PP |
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|
To precompute the gamma correction for a picture: |
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|
.IP "" .2i |
| 209 |
< |
pcomb -e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' pic > pic.gam |
| 209 |
> |
pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' pic > pic.gam |
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|
.PP |
| 211 |
|
To perform some special filtering: |
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|
.IP "" .2i |
| 213 |
< |
pcomb -f myfilt.cal -x xmax/2 -y ymax/2 input.pic > filtered.pic |
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> |
pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.pic > filtered.pic |
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|
.PP |
| 215 |
|
To make a picture of a dot: |
| 216 |
|
.IP "" .2i |
| 217 |
< |
pcomb -x 100 -y 100 -e 'ro=b;go=b;bo=b;b=if((x-50)^2+(y-50)^2-25^2,0,1)' > dot |
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> |
pcomb \-x 100 \-y 100 \-e 'ro=b;go=b;bo=b;b=if((x-50)^2+(y-50)^2\-25^2,0,1)' > dot |
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.SH AUTHOR |
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|
Greg Ward |
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|
.SH "SEE ALSO" |
