I believe valid hexadecimal color codes can have 3, 4, 6, or 8 hexadecimal digits, check out css-tricks.com/8-digit-hex-codes.
So, your grep pattern should match all of these... You can achieve this with:
From man re_format: \b matches the null string at a word boundary (either the beginning or end of a word).
Hello,
I have a question on how to filter the data on multiple columns. The problem is I have one table with 25 columns, 4500 rows. I need to filter out the data based on some codes like 'XXXX', I have 25 codes to check on that table. My requirement is that which ever row has this code I... (1 Reply)
Hi,
I have a file containing color codes:
Fri May 25 17:13:04 2012: Starting MTA: exim4^ Loading cpufreq kernel modules...^How can I display it colorized on a linux terminal? (4 Replies)
I have put some yellow color codes and works well.
I call the funstion using
print_usage(stderr, 0);
I would like to know if there is any way, to store the ansi color codes in variables and then call them inside fprintf.
Or have a format followed by the strings I want to output.
... (5 Replies)
I want to have all hex color codes in a given stylesheet in uppercase, so #fff should be converted to #FFF for instance. Here is the regular expression I use to match and convert hex color codes to uppercase:
sed -e 's/^#({3}$)|({6}$)/^#({3}$)|({6}$)/' main.css
However, no conversion to uppercase... (6 Replies)
Hi all,
Not sure how "for dummies" this question is, but I'd better use understatement...
A. My Environment
==============
I am using RedHat Linux, version 2.6.18-53.el5.
When I type less --version I get:
less 394
Copyright (C) 1984-2005 Mark Nudelman
...
My terminal is configured... (1 Reply)
ppmchange(1) General Commands Manual ppmchange(1)NAME
ppmchange - change all pixels of one color to another in a portable pixmap
SYNOPSIS
ppmchange [ -closeness closeness_percent ] [ -remainder remainder_color ] [ oldcolor newcolor ] ... [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Changes all pixels of oldcolor to newcolor. You may specify up to 256 oldcolor/newcolor pairs on the
command line. ppmchange leaves all colors not mentioned unchanged, unless you specify the -remainder option, in which case they are all
changed to the single specified color.
You can specify that colors similar, but not identical, to the ones you specify get replaced by specifying a "closeness" factor.
The colors can be specified in five ways:
o A name, assuming that a pointer to an X11-style color names file was compiled in.
o An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to 4-digit hexadecimal numbers.
o An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point numbers between 0 and 1.
o For backwards compatibility, an old-X11-style hexadecimal number: #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.
o For backwards compatibility, a triplet of numbers separated by commas: r,g,b, where r g and b are floating point numbers between 0
and 1. (This style was added before MIT came up with the similar rgbi style.)
If a pixel matches two different oldcolors, ppmchange replaces it with the newcolor of the leftmost specified one.
OPTIONS -closeness closeness_percent
closeness is an integer per centage indicating how close to the color you specified a pixel must be to get replaced. By default, it
is 0, which means the pixel must be the exact color you specified.
A pixel gets replaced if the distance in color between it and the color you specified is less than or equal to closeness.
The "distance" in color is defined as the cartesian sum of the individual differences in red, green, and blue intensities between
the two pixels, normalized so that the difference between black and white is 100%.
This is probably simpler than what you want most the time. You probably would like to change colors that have similar chrominance,
regardless of their intensity. So if there's a red barn that is variously shadowed, you want the entire barn changed. But because
the shadowing significantly changes the color according to ppmchange's distance formula, parts of the barn are probably about as
distant in color from other parts of the barn as they are from green grass next to the barn.
Maybe ppmchange will be enhanced some day to do chrominance analysis.
-remainder color
ppmchange changes all pixels which are not of a color for which you specify an explicit replacement color on the command line to
color color.
An example application of this is
ppmchange -remainder=black red red
to lift only the red portions from an image, or
ppmchange -remainder=black red white | ppmtopgm
to create a mask file for the red portions of the image.
SEE ALSO pgmtoppm(1), ppmcolormask(1), ppm(5)AUTHOR
Wilson H. Bent. Jr. (whb@usc.edu) with modifications by Alberto Accomazzi (alberto@cfa.harvard.edu)
07 January 2001 ppmchange(1)