NAME

SYNOPSIS

pixautosize [-b bytes_per_sample] [-f file_name] [-l file_length]

DESCRIPTION

WIDTH=512; HEIGHT=512

The file name can be specified by using the -f file_name commandline option, or the file length (in bytes) can be specified by using the -l file_length commandline option. One of these two options must be present. In either case, the -b bytes_per_sample option can be used to specify the number of bytes which are used for each sample (pixel) in the file. The default value is three (3), which is appropriate for use with pix(5) files. This should be changed to one with -b 1 when processing a bw(5) file. Similarly, the proper value for a dbw(5) file is 8 (1 channel of 8 byte samples), and the value for dpix(5) files is 24 (3 channels of 8 byte samples).

EXAMPLES

WIDTH=50; HEIGHT=50;

the first could be for a bw(5) file and the second for a pix(5) file:

pixautosize -b 1 -l 2500

pixautosize -b 3 -l 7500

This example shows how to determine the size of a pix(5) file by giving the file name:

pixautosize -b 3 -f ../pix/moss.pix

with the result being

WIDTH=512; HEIGHT=512

This command can be used easily in shell scripts with a line like this:

eval `pixautosize -b 3 -f $FILE` # sets WIDTH, HEIGHT

For a major shell script which uses this program, examine pixinfo.sh(1) .

SEE ALSO

DIAGNOSTICS

pixautosize: unable to autosize nsamples=999

pixautosize: unable to autosize file '/dev/null'

In this case, the string printed on standard output is:

WIDTH=0; HEIGHT=0

AUTHOR

COPYRIGHT

BUG REPORTS