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author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2020-08-02 18:44:01 +0000 |
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committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2020-08-02 18:44:01 +0000 |
commit | ad48d09aa16cf2c106ba4d0e232c703a75ab5c49 (patch) | |
tree | 67fe02ab9d4f8952d6ac8b0aac1674f099f0fd7e /pbmreduce.html | |
parent | 56ef5a9528e4eb818db26d7cee8733d46d6cb687 (diff) | |
download | netpbm-mirror-ad48d09aa16cf2c106ba4d0e232c703a75ab5c49.tar.gz netpbm-mirror-ad48d09aa16cf2c106ba4d0e232c703a75ab5c49.tar.xz netpbm-mirror-ad48d09aa16cf2c106ba4d0e232c703a75ab5c49.zip |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@3905 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pbmreduce.html')
-rw-r--r-- | pbmreduce.html | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/pbmreduce.html b/pbmreduce.html index 5247d14b..3ec1630c 100644 --- a/pbmreduce.html +++ b/pbmreduce.html @@ -13,8 +13,9 @@ pbmreduce - read a PBM image and reduce it N times <b>pbmreduce</b> [<b>-floyd</b>|<b>-fs</b>|<b>-threshold</b>] -[<b>-value</b> <i>val</i>] <i>N</i> +[<b>-value</b> <i>val</i>] [<b>-randomseed=</b><i>integer</i>] +<i>N</i> [<i>pbmfile</i>] <p>You can abbreviate any option to its shortest unique prefix. @@ -27,8 +28,8 @@ pbmreduce - read a PBM image and reduce it N times factor of <i>N</i>, producing a PBM image as output. <p><b>pbmreduce</b> duplicates a lot of the functionality of -<b>pamditherbw</b>; you could do something like <tt>pamscale | -pamditherbw</tt>, but <b>pbmreduce</b> is a lot faster. +<b>pamditherbw</b>; you could do something like <kbd>pamscale | +pamditherbw</kbd>, but <b>pbmreduce</b> is a lot faster. <p>You can use <b>pbmreduce</b> to "re-halftone" an image. Let's say you have a scanner that only produces black&white, not @@ -54,6 +55,10 @@ boustrophedonic Floyd-Steinberg error diffusion; however, you can use this option to specify simple thresholding. This gives better results when reducing line drawings. +<dt><b>-floyd</b>, <b>-fs</b> +<dd>Specify the Floyd-Steinberg error diffusion method. This is the +default. + <dt><b>-value</b> <dd> <p>This option alters the thresholding value for all quantizations. It should |