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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2016-12-31 18:18:12 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2016-12-31 18:18:12 +0000 |
| commit | 0c95c02ee6de4145c60e7ecceadabb9540226b81 (patch) | |
| tree | 6afb8d5161aa6e9e864f3113f2860cb5f3076ccc /pnmcrop.html | |
| parent | 0aeaef49efa4eee979464feb6981a77e038b4d14 (diff) | |
| download | netpbm-mirror-0c95c02ee6de4145c60e7ecceadabb9540226b81.tar.gz netpbm-mirror-0c95c02ee6de4145c60e7ecceadabb9540226b81.tar.xz netpbm-mirror-0c95c02ee6de4145c60e7ecceadabb9540226b81.zip | |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@2867 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pnmcrop.html')
| -rw-r--r-- | pnmcrop.html | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/pnmcrop.html b/pnmcrop.html index 87c010fb..99714a49 100644 --- a/pnmcrop.html +++ b/pnmcrop.html @@ -2,13 +2,13 @@ <HTML><HEAD><TITLE>Pnmcrop User Manual</TITLE></HEAD> <BODY> <H1>pnmcrop</H1> -Updated: 11 March 2009 +Updated: 31 December 2016 <BR> <A HREF="#index">Table Of Contents</A> <H2>NAME</H2> -pnmcrop - crop a PNM image +pnmcrop - crop a Netpbm image <H2 id="synopsis">SYNOPSIS</H2> @@ -24,8 +24,12 @@ pnmcrop - crop a PNM image [<B>-bottom</B>] +[<b>-verbose</b>] + [<B>-margin=</B><i>pixels</i>] +[<B>-closeness=</B><I>closeness_percent</I>] + [<B>-borderfile=</B><i>filename</i>] [<I>pnmfile</I>] @@ -74,6 +78,7 @@ all input images but the first. <P>If you want to add different borders after removing the existing ones, use <B>pnmcat</B> or <B>pamcomp</B>. + <H2 id="options">OPTIONS</H2> <DL COMPACT> @@ -128,6 +133,28 @@ if necessary. <p>This option was new in Netpbm 10.29 (August 2005). +<dt><B>-closeness=</B><I>closeness_percent</I> + +<p>Any color in the image that is at least this close to the operative +background color is considered to be background. + +<p>You can use this if the image has borders that vary slightly in color, such +as would be the case in a photograph. Consider a photograph against a white +screen. The color of the screen varies slightly with shading and dirt and +such, but is still quite distinct in color from the subject of the +photograph. <b>pnmcrop</b> will choose some particular shade as the +background color and if you specify an appropriate <b>-closeness</b> value, it +will correctly identify all of the screen as background and crop it off. + +<p>To implement more complex rules for identifying background, use +<b>-borderfile</b>. + +<p>The default is zero, which means a pixel's color must exactly match the +background color for the pixel to be considered part of a background border. + +<p>This option was new in Netpbm 10.78 (March 2017). With older Netpbm, +colors must match exactly. + <dt><b>-borderfile=</b><i>filename</i> <dd>Use the image in the file named <i>filename</i> instead of the input |