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.SH SYNOPSIS |
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.B ra_tiff |
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[ |
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< |
.B "-z|-L|-l" |
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> |
.B "-z|-L|-l|-f|-w" |
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][ |
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.B -b |
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][ |
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.B "-g gamma" |
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] |
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{ |
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< |
.B "in.pic|-" |
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> |
.B "in.hdr|-" |
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} |
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.B out.tif |
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.br |
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] |
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.B in.tif |
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[ |
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< |
.B "out.pic|-" |
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> |
.B "out.hdr|-" |
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] |
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.SH DESCRIPTION |
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.I Ra_tiff |
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use this option under advisement. |
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The |
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.I \-l |
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< |
option specifies SGILOG24 compressed output, which has slightly |
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> |
option specifies SGILOG24 compressed output, which has |
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less dynamic range than SGILOG, but may be smaller in some cases. |
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< |
(It may also be larger in some cases.)\0 |
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> |
(It is usually larger.)\0 |
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> |
The |
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> |
.I \-f |
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> |
option specifies 32-bit IEEE floating-point/primary output, which |
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> |
is the highest resolution format but results in very large files, since |
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> |
each RGB pixel takes 96 bits (12 bytes) and does not compress well. |
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> |
The |
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> |
.I \-w |
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> |
option specifies 16-bit/primary output, which is understood by |
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> |
some photo editing software, such as Adobe Photoshop. |
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Decompression is automatically determined for TIFF input. |
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.PP |
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The |
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option specifies an exposure compensation in f-stops (powers of two). |
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Only integer stops are allowed, for efficiency. |
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.PP |
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+ |
If the Radiance input is a hyperspectral picture, it will be |
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+ |
converted accurately if the output is anything but 24-bit RGB. |
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In the latter case, the converted colors will be approximate. |
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.PP |
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The |
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.I \-r |
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option invokes a reverse conversion, from a TIFF image to |
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.SH EXAMPLES |
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To convert a Radiance picture to SGILOG-compressed TIFF format: |
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.IP "" .2i |
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< |
ra_tiff -L scene1.pic scene1.tif |
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> |
ra_tiff \-L scene1.hdr scene1.tif |
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.PP |
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To later convert this image back into Radiance and display using |
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human visibility tone-mapping: |
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.IP "" .2i |
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< |
ra_tiff -r scene1.tif scene1.pic |
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> |
ra_tiff \-r scene1.tif scene1.hdr |
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.br |
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< |
ximage -e human scene1.pic |
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> |
ximage \-e human scene1.hdr |
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.SH AUTHOR |
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< |
Greg Ward Larson |
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> |
Greg Ward |
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.br |
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Sam Leffler |
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.SH ACKNOWLEDGEMENT |
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A gamma value other than 2.2 is not properly recorded or understood if |
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recorded in the TIFF file. |
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.SH "SEE ALSO" |
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< |
pfilt(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), |
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> |
pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), |
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ra_t16(1), ximage(1) |
