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)