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Pamfixtrunc User Manual(0)					       Pamfixtrunc User Manual(0)

       pamfixtrunc - repair a Netpbm image whose file is truncated




       This program is part of Netpbm(1)

       pamfixtrunc reads as much as it can of a Netpbm image that may be truncated (i.e. the file
       may not contain the last part of the image) and writes out a valid Netpbm  image  that  is
       just missing the bottom rows of the original (pre-truncation) image.

       The  header of a Netpbm image implies how large the image must be (how many bytes the file
       must contain).  If the file is actually smaller than that, a Netpbm program that tries  to
       read  the  image  fails, with an error message telling you that it couldn't read the whole
       file.  The data in the file is arranged in row order, from top to  bottom,  and	the  most
       common  reason for the file being smaller than its header says it should be is because the
       bottommost rows are simply missing.  So pamfixtrunc assumes that is the case and generates
       a  new  image with just the rows that are readable.  (technically, that means the output's
       header indicates a smaller number of rows and omits any partial last row).

       The most common way for a Netpbm file to be small is that something interrupted	the  pro-
       gram  that generated it before it was finished writing the file.  For example, the program
       ran out of its own input or encountered a bug or ran out of space in which  to  write  the

       Another problem pamfixtrunc deals with is where the file isn't actually too small, but due
       to a system error, a byte in the middle of it cannot be read  (think  of  a  disk  storage
       failure).   pamfixtrunc	reads the input sequentially until it can't read any further, for
       any reason.  So it treats such an image as a truncated one, ignoring all  data  after  the
       unreadable byte.

       But  be	aware  that  an image file is sometimes too small because of a bug in the program
       that generated it, and in that case it is not simply a matter of the bottom of  the  image
       missing, so pamfixtrunc simply creates a valid Netpbm image containing a garbage picture.

       pamfixtrunc looks at only on the first image in a multi-image stream.

       If  you	want to test an image file to see if it is corrupted by being too small, use pam-
       file --allimages .  It fails with an error message if the file is too small.

       If you want to cut the bottom off a valid Netpbm image, use pamcut.

       pnm(5) , pam(5) , pamcut(1) , pamfile(1) ,

       pamfixtrunc was new in Netpbm 10.38 (March 2007).

netpbm documentation			 06 January 2006	       Pamfixtrunc User Manual(0)
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