11-14-2014
Quote:
Originally Posted by
ksmarine1980
Thank you, Carona. I'll try that but would like to learn how to do it both ways.
I told you both ways.
Quote:
Originally Posted by
ksmarine1980
I'm using it as part of an exercise in the book. In this respect, I want to use it (or tcsh)
CSH is not UNIX, it's a nonstandard language which was popular in the early 80's(it supported "fancy" things like line editing!) but has only clung to a weird, tenuous life since then -- mostly through it being forcefed to new students through badly out-of-date textbooks. Occasional old systems still run it to use scripts old enough to be having mid-life crises. Kind of the UNIX equivalent of qbasic.
These days a proper UNIX shell has all the same advantages with none of the notorious design flaws.
Last edited by Corona688; 11-14-2014 at 11:39 AM..
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT REDHAT
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)