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anytopnm - convert an arbitrary type of image file to PBM, PGM, or PPM
This program is part of Netpbm(1)
anytopnm converts the input image, which may be in any of about 100 graphics formats, to
PBM, PGM, or PPM format, depending on that nature of the input image, and outputs it to
To determine the format of the input, anytopnm uses the file program (possibly assisted by
the magic numbers file fragment included with Netpbm). If that fails (very few image for-
mats have magic numbers), anytopnm looks at the filename extension. If that fails, any-
The type of the output file depends on the input image.
anytopnm uses the converters for particular graphics formats that are in the Netpbm pack-
age, so it can't convert any format that you couldn't convert with some other Netpbm pro-
gram. What anytopnm adds is the ability to recognize the format and choose the appropri-
ate Netpbm program to convert it. For example, if you invoke anytopnm on a GIF file, any-
topnm will recognize that it is a GIF file and therefore giftopnm knows how to convert it
to PNM, so anytopnm invokes giftopnm.
anytopnm cannot recognize every possible input format, so you may still be able to convert
an image with a specific Netpbm program when anytopnm fails to convert it.
If file indicates that the input file is compressed (either via Unix compress, gzip, or
bzip compression), anytopnm uncompresses it and proceeds as above with the uncompressed
If file indicates that the input file is encoded by uuencode or btoa, anytopnm decodes it
and proceeds as above with the decoded result.
If file is - or not given, anytopnm takes its input from Standard Input.
pamfile(1) , pnm(1) , file man page
Copyright (C) 1991 by Jef Poskanzer.
netpbm documentation 05 September 2006 Anytopnm User Manual(0)