pamwipeout - replace detail with smooth gradient from one edge to the other

WillemvanSchaik wrote this program in January 2011 and contributed it to Netpbm.

       This program is part of Netpbm(1).

       The pamwipeout utility takes a Netpbm image as input and the uses two opposite edges of the image to wipe
       out anything in between.  You can use it in combination with pamcut and  pnmpaste  /  pamcomp  to  remove
       unwanted  parts  of  a  larger  image.   The  program replaces the pixels in between the two edges with a
       gradient from one edge to the other.

       In top-bottom mode, the program reads the whole image into memory before it  can  start  processing.   In
       left-right  it  will  read the image a row at the time, process that row and write it to the output file.
       Therefore, in case of very large images, it may be better to use instead of "pamwipeout-tb"  a  pipe  of
       "pamflip-cw|pamwipeout-lr|pamflip-ccw".

       In his blog at

       www.i-am.ws , the author wrote about a predecessor of "pamwipeout" at the time named "pnmblend". It shows
       a good example of what can be accomplished with this utility.

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master  documentation
       is at

              http://netpbm.sourceforge.net/doc/pamwipeout.html

netpbm documentation                            26 February 2011                       PamwipeoutUserManual(1)

pamwipeout was new in Netpbm 10.54 (March 2011).

       pamwipeout - replace detail with smooth gradient from one edge to the other

       In addition to the options common to all programs based on libnetpbm (most notably  -quiet,  see   Common
       Options ), pamwipeout recognizes the following command line options:

       -tb | -lr

              This  option chooses between a vertical and a horizontal gradient.  You must specify one of these,
              but not both.

Filenameisthenameoftheinputfile.Ifyoudon'tspecifythis,pamwipeoutreadstheimagefromStandardInput.

pam(1) and pamflip(1), pamcut(1), pamcomp(1), pnmpaste(1).

pamwipeout {-lr|-tb} [filename]

       Minimum  unique  abbreviation  of  options  is  acceptable.  You may use double hyphens instead of single
       hyphen to denote options.