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.SH SYNOPSIS |
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.B macbethcal |
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[ |
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< |
.B "\-d debug.pic" |
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> |
.B "\-d debug.hdr" |
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][ |
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.B "\-p xul yul xur yur xll yll xlr ylr" |
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] |
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< |
.B scannedin.pic |
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> |
.B scannedin.hdr |
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[ |
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.B calibout.cal |
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] |
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.B macbethcal |
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.B \-c |
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[ |
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< |
.B "\-d debug.pic" |
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> |
.B "\-d debug.hdr" |
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] |
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[ |
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.B measured.xyY |
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Computing a mapping from measured colors is usually more convenient |
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when calibrating a particular output device. |
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This is accomplished by printing the picture |
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< |
.I macbeth_spec.pic |
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> |
.I macbeth_spec.hdr |
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(which may be found in the standard RADIANCE library directory in |
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the lib subdirectory) and measuring the output with a chroma meter |
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or spectrophotometer. |
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To compute a calibration for a FunkyThing scanner and check the |
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results: |
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.IP "" .2i |
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< |
ra_tiff -r mbscan.tif mbscan.pic |
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> |
ra_tiff \-r mbscan.tif mbscan.hdr |
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.br |
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< |
macbethcal -d debug.pic mbscan.pic FunkyThing.cal |
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> |
macbethcal \-d debug.hdr mbscan.hdr FunkyThing.cal |
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.br |
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< |
ximage debug.pic |
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> |
ximage debug.hdr |
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.PP |
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To apply this computed calibration to another scanned image: |
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.IP "" .2i |
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< |
ra_tiff -r another.tif | pcomb -f FunkyThing.cal - > another_calib.pic |
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> |
ra_tiff \-r another.tif | pcomb \-f FunkyThing.cal \- > another_calib.hdr |
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.PP |
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To compute a calibration file for the BigWhiz film recorder, after |
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< |
taking measurements of a slide made from macbeth_spec.pic: |
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> |
taking measurements of a slide made from macbeth_spec.hdr: |
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.IP "" .2i |
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< |
macbethcal -c macbeth_spec.xyY BigWhiz.cal |
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> |
macbethcal \-c macbeth_spec.xyY BigWhiz.cal |
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.PP |
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To prepare a picture prior to output on the same film recorder: |
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.IP "" .2i |
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< |
pcomb -f BigWhiz.cal standard.pic > toprint.pic |
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> |
pcomb \-f BigWhiz.cal standard.hdr > toprint.hdr |
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.PP |
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To use |
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.I pcond(1) |
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to also adjust the image for human response: |
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.IP "" .2i |
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< |
pcond -f BigWhiz.cal -h standard.pic > toprint.pic |
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> |
pcond \-f BigWhiz.cal \-h standard.hdr > toprint.hdr |
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.SH AUTHOR |
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Greg Ward |
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.br |
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Paul Heckbert supplied code for perspective projective mapping |
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.SH "SEE ALSO" |
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< |
calc(1), pcomb(1), pcond(1), pfilt(1), ximage(1) |
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> |
icalc(1), pcomb(1), pcond(1), pfilt(1), ximage(1) |
