Solaris image file extension Post: 302556238

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Operating Systems Solaris Solaris image file extension Post 302556238 by jim mcnamara on Saturday 17th of September 2011 11:18:01 AM

09-17-2011

Registered User

Image is a term with several meanings.

First off, an extension, all by itself does not proclaim a file type in UNIX. The file command will tell you what kind of file you have, based on a "magic number" (really a header). Windows does not do that.

A graphics file is one of a lot of formats - jpeg, mpeg, png, etc. So it has a header particualr to the format.

An image is a copy of an executable, usually image files in the sense I think you mean are copies of the kernel. The name comes from the fact that the executable file many years ago was an image (almost exact duplicate) of what the executable looked like in memory. This is not necessarily true now, except in some cases.

More to the point - what are you trying to do? graphics?

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anytopnm

anytopnm(1)						      General Commands Manual						       anytopnm(1)

NAME

       anytopnm - attempt to convert an unknown type of image file to a portable anymap

SYNOPSIS

       anytopnm [file]

DESCRIPTION

       anytopnm  converts the input image, which may be in any of dozens of graphics formats, to PBM, PGM, or PPM format, depending on that nature
       of the input image, and outputs it to Standard Output.

       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 formats have magic numbers), anytopnm looks at the filename extension.  If that fails, anytopnm
       punts.

       The type of the output file depends on the input image.

       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 result.

       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.

SEE ALSO

       pnmfile(1), pnm(5), file(1)

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

								   11 July 2000 						       anytopnm(1)