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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2019-02-09 17:32:42 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2019-02-09 17:32:42 +0000 |
| commit | 598441aa09a2e3b2fa45abb8a758ff76c68f9c9e (patch) | |
| tree | ce88219b8ea8379616627a5b9ef0ceef6168c4c7 /pnmcolormap.html | |
| parent | 113816c8e6cba3de50501d6fa01b017b529bd3fa (diff) | |
| download | netpbm-mirror-598441aa09a2e3b2fa45abb8a758ff76c68f9c9e.tar.gz netpbm-mirror-598441aa09a2e3b2fa45abb8a758ff76c68f9c9e.tar.xz netpbm-mirror-598441aa09a2e3b2fa45abb8a758ff76c68f9c9e.zip | |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@3542 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pnmcolormap.html')
| -rw-r--r-- | pnmcolormap.html | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/pnmcolormap.html b/pnmcolormap.html index 9137dd68..b918dee6 100644 --- a/pnmcolormap.html +++ b/pnmcolormap.html @@ -2,7 +2,7 @@ <HTML><HEAD><TITLE>Pnmcolormap User Manual</TITLE></HEAD> <BODY> <H1>pnmcolormap</H1> -Updated: 28 October 2017 +Updated: 09 February 2019 <BR> <A HREF="#index">Table Of Contents</A> @@ -150,8 +150,8 @@ largest spread of brightness; 2) largest spread of contribution to the luminosity of the color. E.g. red is weighted much more than blue. Select among these with the <B>-spreadbrightness</B> and <B>-spreadluminosity</B> options. The default is <B>-spreadbrightness</B>. Where there are multiple -colors of the mediam magnitude, they are distributed arbitrarily among between -the suboxes. This arbitrary distribution depends upon what the system's +colors of the median magnitude, they are distributed arbitrarily among between +the subboxes. This arbitrary distribution depends upon what the system's <b>qsort</b> function does with multiple equal values, so <b>pnmcolormap</b> may produce slightly different results on different systems. @@ -161,11 +161,22 @@ colors in the box, using the above definition of "greater"; 2) the mean of the colors (each component averaged separately by brightness) in the box; 3) the mean weighted by the number of pixels of a color in the image. +<P>Select among these with the <B>-center</B>, <B>-meancolor</B>, and +<B>-meanpixel</B> options. The default is <B>-center</B>. + <P>Note that in all three methods, there may be colors in the output which do not appear in the input at all. -<P>Select among these with the <B>-center</B>, <B>-meancolor</B>, and -<B>-meanpixel</B> options. The default is <B>-center</B>. +<p>Also note that the color chosen to represent the colors in Box A the best +may also represent a color in Box B better than the color chosen to represent +the colors in Box B the best. This is true for various measures of goodness +of representation of one color by another. In particular, if you +use <b>pnmremap</b> to map the colors in the very image that you used to +create the color map to the colors in that colormap, the colors in Box B will +often map to the color <b>pnmcolormap</b> chose to represent some other box +and in fact the color <b>pnmcolormap</b> chose to represent Box B may not +appear in the <b>pnmremap</b> output at all. + <H2 id="references">REFERENCES</H2> |