convert a portable bitmap into ASCII graphics
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portable bitmap as input. Produces a somewhat crude ASCII
graphic as output.
Note that there
is no asciitopbm tool - this transformation is one-way.
and -2x4 flags give you two alternate ways for the
bits to get mapped to characters. With 1x2, the
default, each character represents a group of 1 bit across
by 2 bits down. With -2x4, each character represents
2 bits across by 4 bits down. With the 1x2 mode you can see
the individual bits, so it’s useful for previewing
small bitmaps on a non-graphics terminal. The 2x4 mode lets
you display larger bitmaps on a standard 80-column display,
but it obscures bit-level details. 2x4 mode is also good for
displaying graymaps - "pnmscale -width 158 | pgmnorm |
pgmtopbm -thresh" should give good results.
1988, 1992 by Jef Poskanzer.