pamfix
repairs corrupted Netpbm images
TLDR
Clip sample values that exceed the maxval
$ pamfix -clip [corrupted.pam] > [fixed.pam]
Raise the maxval to accommodate out-of-range values$ pamfix -changemaxval [corrupted.pam] > [fixed.pam]
Truncate the image at the first invalid sample value$ pamfix -truncate [corrupted.pam] > [fixed.pam]
Fix with verbose output$ pamfix -clip -verbose [corrupted.pam] > [fixed.pam]
SYNOPSIS
pamfix [options] [file]
DESCRIPTION
pamfix reads a stream that is mostly a Netpbm image but may have certain types of corruptions and produces a valid Netpbm image that preserves much of the information in the original. It handles two primary corruption types: truncated streams and illegally large sample values. Part of the Netpbm package.
PARAMETERS
FILE
Input PAM/PNM file. Reads from standard input if not specified.-clip
Clip all pixel values that exceed the maxval stated in the header to the maxval. Cannot be combined with -changemaxval.-changemaxval
Raise the maxval to accommodate pixel values that exceed the maxval stated in the header, lowering the fraction represented by every sample. Cannot be combined with -clip.-truncate
Truncate the image at the first invalid sample value. When neither -clip nor -changemaxval is specified, this is the default behavior for out-of-range values.-verbose
Report details of the repair to standard error.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
You cannot specify both -clip and -changemaxval. May not fix all types of corruption. Some data loss is possible with truncation.
SEE ALSO
pamfixtrunc(1), pamfile(1), pamvalidate(1), pamcut(1), netpbm(1)
