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.\" RCSid "$Id: ran2tiff.1,v 1.1 2005/09/17 05:14:14 greg Exp $" |
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.TH RAN2TIFF 1 9/16/2005 RADIANCE |
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.SH NAME |
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ran2tiff - expose and convert a RADIANCE animation to TIFF frames |
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.SH SYNOPSIS |
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.B ran2tiff |
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[ |
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.B "-W prev_frame_wt" |
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][ |
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.B "-H histo" |
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][ |
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.B "-D dir" |
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] |
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[ |
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.B "pcond opts" |
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] |
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[ |
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.B "ra_tiff opts" |
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] |
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.B "frame1.pic frame2.pic .." |
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.SH DESCRIPTION |
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.I Ran2tiff |
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takes an animated sequence of Radiance pictures and converts them by calling |
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.I pcond(1) |
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and |
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.I ra_tiff(1) |
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in such a way that exposure changes gradually |
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from one frame to the next. |
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It accomplishes this by computing a histogram for each image and |
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blending it with a weighted histogram from the previous frame, |
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where the weight is set by the |
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.I \-W |
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option, or 0.9 by default. |
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A value of 0.5 would mean that the previous frame carries 1/2 the weight |
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of the current one, and the frame before that 1/4, 1/8 before that, |
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and so on. |
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.PP |
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The |
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.I \-H |
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option specifies a histogram file to be used to ensure continuous |
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exposure between the current sequence and one before it. |
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If the file does not exist, it will be created at the end of |
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the conversion. |
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If it does exist, its contents will be used as the histogram |
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at the end of the previous sequence. |
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.PP |
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The |
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.I \-D |
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option may be used to specify an output directory for the resulting |
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TIFF frames. |
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Otherwise, the current directory will be used. |
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The output file names will correspond to the input names, but |
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with a ".tif" suffix. |
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.PP |
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Ran2tiff also accepts the standard options for |
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.I pcond |
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and |
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.I ra_tiff, |
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though output to LogLuv TIFF formats is not supported. |
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(There would be no point in adjusting the exposure if the output were HDR.)\0 |
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.SH EXAMPLE |
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To convert a sequence of frames using a rapid human exposure response |
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and LZW compression on the output: |
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.IP "" .2i |
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ran2tiff \-W 0.7 \-h \-z frame*.pic |
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.PP |
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Similar to |
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.I fieldcomb(1), |
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this program works well with the "TRANSFER" facility of |
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.I ranimate(1). |
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.SH AUTHOR |
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Greg Ward |
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.SH "SEE ALSO" |
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fieldcomb(1), getinfo(1), pcond(1), pfilt(1), phisto(1), |
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ra_tiff(1), ranimate(1), rpict(1) |
