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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2018-04-20 19:47:23 +0000 |
|---|---|---|
| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2018-04-20 19:47:23 +0000 |
| commit | 42098725cc6d9484c2d8b5c0427f38754c0a17c8 (patch) | |
| tree | 08de2c828c340d550694088b7731a588bf04c652 /pamlevels.html | |
| parent | d7b432edb34becdf5949c072b16e6cee27dc1289 (diff) | |
| download | netpbm-mirror-42098725cc6d9484c2d8b5c0427f38754c0a17c8.tar.gz netpbm-mirror-42098725cc6d9484c2d8b5c0427f38754c0a17c8.tar.xz netpbm-mirror-42098725cc6d9484c2d8b5c0427f38754c0a17c8.zip | |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@3205 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pamlevels.html')
| -rw-r--r-- | pamlevels.html | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/pamlevels.html b/pamlevels.html index 6f3c4db3..15e85176 100644 --- a/pamlevels.html +++ b/pamlevels.html @@ -2,7 +2,7 @@ <HTML><HEAD><TITLE>Pamlevels User Manual</TITLE> </HEAD><BODY> <H1>pamlevels</H1> -Updated: 08 April 2018 +Updated: 10 April 2018 <BR> <A HREF="#index">Table Of Contents</A> @@ -38,17 +38,16 @@ color-mapping options may be shortened to <b>-f1</b>...<b>-f3</b> and <b>-t1</b>...<b>-t3</b>. <p>Color values have the following format: -<i>color</i>[:<i>scale</i>], where <i>color</i> is -a <a href="libppm.html#colorname"> Netpbm color specification</a> -and <i>scale</i> an optional coefficient that is applied to each component -of <i>color</i>. - -<p>The transformation preserves -<A HREF="http://www.c-f-systems.com/ColorIntegrity.html">color integrity</A>. +<i>color</i>[:<i>scale</i>], where <i>color</i> is a +<a href="libppm.html#colorname"> Netpbm color specification</a> and +<i>scale</i> an optional coefficient that is applied to each RGB component (in +the standard Netpbm gamma-adjusted color space) of <i>color</i>. <p>When the transformation is linear (i.e. uses two mappings) and preserves zero (i.e. maps black to black), it corresponds to multiplication of light -intensity by a constant. +intensity by a constant and preserves +<A HREF="http://www.c-f-systems.com/ColorIntegrity.html">color integrity</A>. + <H2 id="examples">EXAMPLES</H2> In the examples below, <code>\</code> denotes a line continuation: @@ -70,7 +69,7 @@ pamlevels -f1 black -t1 black\ <pre>pamlevels \ -f1 black -t1 black -f2 white -t2 white \ -f3 white:0.5 -t3 white:0.6 in.ppm > out.ppm</pre> -The latter tranformation similar to gamma-correction. +The latter tranformation is similar to gamma-correction. <h2 id="options">OPTIONS</h2> @@ -93,8 +92,9 @@ variation on PPM where the samples are proportional to light intensity, rather than brightness (gamma-adjusted) as in true PPM. The input must be of this form and the <b>pamlevels</b> makes the output of this form. -<p>Note that the numbers in a <b>rgbi:</b> color specification are brightness -levels (gamma-adjusted) regardless of the input and output format. +<p>Note that the numbers in a color specification like +<b>rgbi:0.9/0.83/0.80</b> are brightness levels (gamma-adjusted) regardless of +the input and output format. <p>You cannot use this with <b>-fitbrightness</b> because that function is not implemented. |