11-02-2017
Quote:
Originally Posted by
SIMMS7400
Hi Rucdi - what are you looking for?
Some diligence and creativity from your side.
Quote:
Let me know what else you require - thank you!
For instance quantitative answers to my questions above - WHAT doesn't work? WHAT did you try, and how did it fail? HOW creative have you been to circumnavigate the difficulties? What be your OS and shell versions?
version sh (AT&T Research) 93t+ 2009-05-01 is not something that I recognise. And, even if it were a
sh version, it should recognize some parameter expansions. Did you try those? How did they fail?
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LEARN ABOUT ULTRIX
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)