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.SH EXAMPLES |
| 215 |
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To produce a picture showing the difference between pic1 and pic2: |
| 216 |
|
.IP "" .2i |
| 217 |
< |
pcomb \-e 'ro=ri(1)\-ri(2);go=gi(1)\-gi(2);bo=bi(1)\-bi(2)' pic1 pic2 > diff |
| 217 |
> |
pcomb \-e "ro=ri(1)\-ri(2);go=gi(1)\-gi(2);bo=bi(1)\-bi(2)" pic1 pic2 > diff |
| 218 |
|
.PP |
| 219 |
|
Or, more efficiently: |
| 220 |
|
.IP "" .2i |
| 222 |
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.PP |
| 223 |
|
To precompute the gamma correction for a picture: |
| 224 |
|
.IP "" .2i |
| 225 |
< |
pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' inp.hdr > gam.hdr |
| 225 |
> |
pcomb \-e "ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4" inp.hdr > gam.hdr |
| 226 |
|
.PP |
| 227 |
|
To perform some special filtering: |
| 228 |
|
.IP "" .2i |
| 230 |
|
.PP |
| 231 |
|
To make a picture of a dot: |
| 232 |
|
.IP "" .2i |
| 233 |
< |
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 |
| 233 |
> |
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 |
| 234 |
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.PP |
| 235 |
|
Use a depth buffer to superimpose 3-D gridlines on rendered image: |
| 236 |
|
.IP "" .2i |
| 237 |
|
rcollate -hi -ff -o 3000x3000 raw_orig.zbf |
| 238 |
< |
| pcomb -e 't=gi(2);Px=Ox(1)+t*Dx(1);Py=Oy(1)+t*Dy(1);Pz=Oz(1)+t*Dz(1)' |
| 239 |
< |
-e 'frac(x):x-floor(x)' -e 'Rg:0;Gg:0;Bg:1;gsiz:0.04' |
| 240 |
< |
-e 'ingr=gsiz-min(frac(Px),frac(Py),frac(Pz))' |
| 241 |
< |
-e 'ro=if(ingr,Rg,ri(1));go=if(ingr,Gg,gi(1));bo=if(ingr,Bg,bi(1))' |
| 238 |
> |
| pcomb -e "frac(x):x-floor(x);EPS:.0001" |
| 239 |
> |
-e "t=gi(2);Px=Ox(1)+t*Dx(1)-EPS;Py=Oy(1)+t*Dy(1)-EPS;Pz=Oz(1)+t*Dz(1)-EPS" |
| 240 |
> |
-e "Rg:0;Gg:0;Bg:1;gsiz:0.03" |
| 241 |
> |
-e "ingr=gsiz-min(frac(Px),frac(Py),frac(Pz))" |
| 242 |
> |
-e "ro=if(ingr,Rg,ri(1));go=if(ingr,Gg,gi(1));bo=if(ingr,Bg,bi(1))" |
| 243 |
|
raw_orig.hdr - > trans_def_grid.hdr |
| 244 |
|
.SH ENVIRONMENT |
| 245 |
|
RAYPATH the directories to check for auxiliary files. |
| 247 |
|
Greg Ward |
| 248 |
|
.SH "SEE ALSO" |
| 249 |
|
getinfo(1), icalc(1), pcompos(1), pfilt(1), pvalue(1), rcalc(1), |
| 250 |
< |
rcollate(1), rmtxcomb(1), rmtxop(1), rpict(1) |
| 250 |
> |
rcollate(1), rcomb(1), rmtxop(1), rpict(1) |
