compare null with non-null Post: 302095114

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hello all, In many shell scripts i found '> /dev/null' , i am not able to get this, will any one please explain why we are using this. thanks sudha

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ran2tiff

RAN2TIFF(1)						      General Commands Manual						       RAN2TIFF(1)

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 previ-
       ous 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)

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