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.\" RCSid $Id$ |
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.TH NORMTIFF 1 2/25/99 RADIANCE |
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.SH NAME |
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normtiff - tone-map and convert RADIANCE picture or SGILOG TIFF to RGB TIFF |
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normtiff - tone-map and convert RADIANCE picture or HDR TIFF to standard TIFF |
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.SH SYNOPSIS |
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.B normtiff |
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[ |
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.B output.tif |
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.SH DESCRIPTION |
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.I Normtiff |
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prepares a Radiance picture or SGILOG (high dynamic range) TIFF |
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prepares a Radiance picture or high dynamic-range TIFF |
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for output to a display or hard copy device. |
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If the dynamic range of the scene exceeds that of the display (as is |
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usually the case), |
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(See the |
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.I getinfo(1) |
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program.)\0 |
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If the input is neither a RADIANCE picture nor an SGILOG-encoded TIFF, |
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If the input is neither a RADIANCE picture nor a high dynamic-range TIFF, |
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the program reports an error and exits. |
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Hyperspectral radiance pictures are silently converted to RGB, though |
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the colors will be more accurate if the HSR picture is passed through |
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.I ra_xyze(1), |
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first. |
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.PP |
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The following command line options are understood. |
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Since this program is very similar to |
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.TP 10n |
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.BR -b |
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Toggle 8-bit black and white (grayscale) TIFF output. |
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If the input is a 16-bit SGILOG luminance-only TIFF, this switch is |
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If the input is a grayscale TIFF, this switch is |
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automatically selected. |
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Otherwise, the output defaults to 24-bit RGB. |
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.TP |
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.BR -z |
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Output LZW-compressed TIFF (smaller file). |
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.TP |
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.BR -h |
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Mimic human visual response in the output. |
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The goal of this process is to produce output that correlates |
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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, which is typical for CRT monitors. |
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The default value is 100, which is typical for LCD monitors. |
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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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.SH EXAMPLES |
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To convert a RADIANCE picture to an 8-bit grayscale TIFF: |
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.IP "" .2i |
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normtiff -b scene.pic sceneb.tif |
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normtiff \-b scene.hdr sceneb.tif |
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.PP |
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To condition an SGILOG TIFF for a particular film recorder with |
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To condition a high dynamic-range TIFF for a particular film recorder with |
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known color primaries, dynamic range and gamma response: |
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.IP "" .2i |
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pcond -d 50 -g 2.5 -p .580 .340 .281 .570 .153 .079 .333 .333 orig.tif filmrgb.tif |
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pcond \-d 50 \-g 2.5 \-p .580 .340 .281 .570 .153 .079 .333 .333 orig.tif filmrgb.tif |
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.PP |
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To simulate human visual response on a monitor with known maximum luminance: |
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.IP "" .2i |
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normtiff -h -u 80 scene.pic sceneh.tif |
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normtiff \-h \-u 80 scene.hdr sceneh.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 |
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.PP |
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http://positron.cs.berkeley.edu/gwlarson/pixformat/ |
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.SH AUTHOR |
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Greg Ward Larson |
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.SH ACKNOWLEDGMENT |
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This work was supported by Silicon Graphics, Inc. |
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Greg Ward |
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.SH "SEE ALSO" |
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getinfo(1), pcond(1), pflip(1), |
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pvalue(1), protate(1), ra_xyze(1), rpict(1), ximage(1) |
