PIXAUTOSIZE(1)

pixautosize - determine if a file size or byte count is a standard image size

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

pixautosize determines if a given file is one of the standard sizes used in the BRL-CAD package, i.e. one of the sizes recognized by the -a option on pix-fb(1). If the dimensions are recognized, it prints a string suitable for use in a Bourne shell -sh(1)- script to set the variables WIDTH and HEIGHT, e.g.

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).

These two examples both give the result of

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

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

with the result being

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

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

pixinfo.-sh(1)-, pix-fb(1), libfb(3), bw(5), pix(5)

If the file or file_length specified does not match any of the standard sizes, one of these messages is printed on standard error:

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

BRL-CAD Team

This software is Copyright (c) 1989-2021 by the United States Government as represented by U.S. Army Research Laboratory.

Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org