NAME

       ran2tiff - expose and convert a RADIANCE animation to TIFF frames

SYNOPSIS

       ran2tiff [ -W prev_frame_wt ][ -H histo ][ -D dir ] [ pcond opts ] [ ra_tiff opts ] frame1.hdr frame2.hdr
       ..

DESCRIPTION

       Ran2tiff  takes  an  animated  sequence  of  Radiance  pictures and converts them by calling pcond(1) and
       ra_tiff(1) in such a way that exposure changes gradually from one frame to  the  next.   It  accomplishes
       this  by computing a histogram for each image and blending it with a weighted histogram from the previous
       frame, where the weight is set by the -W option, or 0.9 by default.  A value of 0.5 would mean  that  the
       previous frame carries 1/2 the weight of the current one, and the frame before that 1/4, 1/8 before that,
       and so on.

       The  -H  option  specifies  a histogram file to be used to ensure continuous exposure between the current
       sequence and one before it.  If the file does not exist, it will be created at the end of the conversion.
       If it does exist, its contents will be used as the histogram at the end of the previous sequence.

       The -D option may be used to specify an output directory for the resulting TIFF frames.   Otherwise,  the
       current  directory  will  be  used.  The output file names will correspond to the input names, but with a
       ".tif" suffix.

       Ran2tiff also accepts the standard options for pcond and ra_tiff, though output to LogLuv TIFF formats is
       not supported.  (There would be no point in adjusting the exposure if the output were HDR.)

EXAMPLE

       To convert a sequence of frames using a rapid human exposure response and LZW compression on the output:

         ran2tiff -W 0.7 -h -z frame*.hdr

       Similar to fieldcomb(1), this program works well with the "TRANSFER" facility of ranimate(1).

AUTHOR

       Greg Ward

SEE ALSO

       fieldcomb(1), getinfo(1), pcond(1), pfilt(1), phisto(1), ra_tiff(1), ranimate(1), rpict(1)

RADIANCE                                            9/16/2005                                        RAN2TIFF(1)