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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH PCOND 1 10/27/98 RADIANCE |
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.SH NAME |
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pcond - condition a RADIANCE picture for output |
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.BI -d \ Lddyn |
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Specifies the dynamic range for the target output device, which is |
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the ratio of the maximum and minimum usable display luminances. |
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The default value is 32. |
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The default value is 100. |
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.TP |
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.BI -p " xr yr xg yg xb yb xw yw" |
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Specifies the RGB primaries for the target output device. |
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To display an image as a person might perceive it |
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in the actual scene: |
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.IP "" .2i |
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pcond -h final.pic > display.pic |
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pcond \-h final.hdr > display.hdr |
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.br |
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ximage display.pic ; rm display.pic & |
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ximage display.hdr ; rm display.hdr & |
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.PP |
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To do the same on a 24-bit display with known primary values: |
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To do the same on a 24\-bit display with known primary values: |
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.IP "" .2i |
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setenv DISPLAY_PRIMARIES ".580 .340 .281 .570 .153 .079 .333 .333" |
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.br |
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pcond -h -p $DISPLAY_PRIMARIES final.pic | ximage & |
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pcond \-h \-p $DISPLAY_PRIMARIES final.hdr | ximage & |
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.PP |
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To prepare a picture to be sent to a film recorder destined eventually |
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for a slide projector with a minimum and maximum screen luminance of |
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1.5 and 125 candelas/m^2, respectively: |
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.IP "" .2i |
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pcond -d 83 -u 125 final.pic > film.pic |
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pcond \-d 83 \-u 125 final.hdr > film.hdr |
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.PP |
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To do the same if the output colors of the standard image |
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"ray/lib/lib/macbeth_spec.pic" have been measured: |
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"ray/lib/lib/macbeth_spec.hdr" have been measured: |
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.IP "" .2i |
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macbethcal -c mbfilm.xyY > film.cal |
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macbethcal \-c mbfilm.xyY > film.cal |
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.br |
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pcond -d 83 -u 125 -f film.cal final.pic > film.pic |
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pcond \-d 83 \-u 125 \-f film.cal final.hdr > film.hdr |
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.PP |
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To further tweak the exposure to bring out certain areas indicated by |
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dragging the right mouse button over them in |
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.I ximage: |
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.IP "" .2i |
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ximage -op -t 75 final.pic | pcond -i .5 -d 83 -u 125 -f film.cal |
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final.pic > film.pic |
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ximage \-op \-t 75 final.hdr | pcond \-i .5 \-d 83 \-u 125 \-f film.cal |
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final.hdr > film.hdr |
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.PP |
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To use a histogram computed on every 10th animation frame: |
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.IP "" .2i |
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phisto frame*0.pic > global.hist |
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phisto frame*0.hdr > global.hist |
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.br |
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pcond -I -s -c frame0352.pic < global.hist | ra_tiff - frame0352.tif |
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pcond \-I \-s \-c frame0352.hdr < global.hist | ra_tiff \- frame0352.tif |
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.SH REFERENCE |
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Greg Ward Larson, Holly Rushmeier, Christine Piatko, |
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``A Visibility Matching Tone Reproduction Operator for High Dynamic Range |
