12-05-2018
Quote:
Originally Posted by
newbie_01
Hi RudiC
Doesn't work on Solaris but works perfectly on Linux.
Where and how does it fail? Please give as detailed and complete an error message as possible.
Quote:
01 - Why are you escaping the # in the beginning?
man sed:
Quote:
Addresses.
.
.
\cregexpc
Match lines matching the regular expression regexp. The c may be any character.
I use the
# here because the usual
/ is part of the pattern.
Quote:
02 - The p before the (_ is because I want to match a single p? Is that correct?
Yes.
Quote:
03 - The #s//\1t\2/ is the one that I don't understand for the most part. Is it doing another search?
The
# is the final address delimiter. An empty regex (
s//) repeats the last one encountered, here: the address regex.
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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)