1Pamfixtrunc User Manual(0) Pamfixtrunc User Manual(0)
2 pamfixtrunc was replaced in Netpbm 10.66 (March 2014) by pamfix(1).
6 pamfix with a -truncate option is the same thing as pamfixtrunc. But
8 pamfix has other options to repair other kinds of corruption.
9 Another change that came with Netpbm 10.66 is that an invalid sample
11 value (a value greater than the maxval the image declares in its
12 header) is considered by the common Netpbm image reading facility (in
13 libnetpbm) to be unreadable, which means the file is essentially trun‐
14 cated. In older Netpbm, the invalid sample value propagates to the
15 output in a program such as pamfixtrunc. Thus, in older Netpbm a file
16 with 100 rows and an invalid sample value in the 3rd row would pass
17 through pamfixtrunc unchanged. But in Netpbm 10.66, pamfix -truncate
18 with the same input would produce an output image with only 2 rows.
19 While it is not possible in 10.66 to cause pamfix to generate an
20 invalid Netpbm image, you can use -clip and -changemaxval options to
21 avoid truncating the file in a case like this.
22 You should not make any new use of pamfixtrunc and if you modify an
24 existing use, you should upgrade to pamfixtrunc. But note that if you
25 write a program that might have to be used with very old Netpbm, pam‐
26 fixtrunc is the only way to do that.
27
29 This manual page was generated by the Netpbm tool 'makeman' from HTML
30 source. The master documentation is at
31 http://netpbm.sourceforge.net/doc/pamfixtrunc.html
33netpbm documentation Pamfixtrunc User Manual(0)