All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one. You may separate an option name and its value with white space instead of an equals sign.
This program is part of Netpbm.
pamslice extracts one line of tuples (pixels) out of a Netpbm image and prints their values in a table. A line means a row or column. It shows you a one-dimensional cross section of a two-dimensional image. (With the -plane option, it can be thought of as a one-dimensional cross-section of a three-dimensional image).
The table has one line per tuple, consisting of blank-separated ASCII decimal numbers. The first number is the column number if you specified a row slice or the row number if you specified a column slice. The rest of the numbers are the sample values in plane number order. For a PBM or PGM input, there is only one plane. For a PPM input, Plane 0 is red, Plane 1 is green, and Plane 2 is blue. See the specifications of the image formats for details on exactly what these numbers mean. If you want to see all the pixels in a PPM, PGM, or PBM image in ASCII decimal, pnmtoplainpnm is a good way to do that.
You cannot specify both -row and -column.
You cannot specify both -row and -column.
If you don't specify -plane, you get all the planes -- each line of output has multiple numbers in addition to the sequence number. If you do specify -plane, each line of output contains one number in addition to the sequence number.
pamslice replaced pgmslice in Netpbm 10.3 (June 2002). It was backward compatible, but worked on Netpbm images other than PGM and PBM and added the -plane and -xmgr options.
Jos Dingjan <[email protected]> wrote pgmslice after being unable to find the source code to Marco Beijersbergen's program with the same name. Bryan Henderson converted it to pamslice.