Pamseq User Manual(0) Pamseq User Manual(0)
pamseq - generate PAM image of all possible tuple values, in sequence
pamseq [-tupletype tupletype] depth maxval
All options can be abbreviated to their shortest unique prefix. You
may use two hyphens instead of one to designate an option. You may use
either white space or an equals sign between an option name and its
This program is part of Netpbm(1).
pamseq generates a PAM image of a specified depth and specified maxval
that consists of a single row. The row consists of one tuple of every
possible value, in order.
For a depth of one, the order is simple: From 0 to maxval, going from
left to right. For higher depths, the highest numbered plane goes from
0 to maxval (going left to right) while all the other planes have value
0. Then the sequence repeats except with the next highest plane set to
a value of 1, then 2, etc.
This is the value of the "tuple_type" attribute of the created
PAM image. It can be any string up to 255 characters.
To create a simple ramp of the values 0..255, for input to various
matrix calculations, try
pamseq 1 255
(Before pamseq existed, pgmramp was often pressed into service for
To create a PPM color map of all the possible colors representable with
a maxval of 5, do
pamseq 3 5 -tupletype=RGB | pamtopnm
Again, with a modern program based on the Netpbm library, you don’t
need the pamtopnm because a PAM RGB image is equivalent to a PPM image.
You can use such a color map with pnmremap(1)toquantizethecolorsinan
image. With the maxval of 5 given in the example, you get a color map
of the set of "web safe" colors as defined by Netscape. Most web
browsers guarantee that they can produce at least these 216 colors (215
pnmremap(1), pamtopnm(1), pam(1)
pamseq was added to Netpbm in June 2002.
netpbm documentation 8 May 2002 Pamseq User Manual(0)
Man(1) output converted with