BigSmoke » ImageMagick http://blog.bigsmoke.us Smokes your problems, coughs fresh air. Sat, 04 Feb 2012 18:03:39 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Removing unwanted grey values in scanning white papers http://blog.bigsmoke.us/2009/09/20/removing-unwanted-grey-values-in-scanning-white-papers http://blog.bigsmoke.us/2009/09/20/removing-unwanted-grey-values-in-scanning-white-papers#comments Sun, 20 Sep 2009 11:02:03 +0000 halfgaar http://blog.bigsmoke.us/?p=823 When doing automated scanning, like I do to for properly organizing paper administration, the resulting images can get quite large because the background has near-white information that is still very complex to save. Imagemagick has nice solution for that; -white-threshold x%. It also has -black-threshold, should it be necessary.

]]> http://blog.bigsmoke.us/2009/09/20/removing-unwanted-grey-values-in-scanning-white-papers/feed 3 ImageMagick can convert PDF to anything http://blog.bigsmoke.us/2009/02/03/imagemagick-can-convert-pdf-to-anything http://blog.bigsmoke.us/2009/02/03/imagemagick-can-convert-pdf-to-anything#comments Tue, 03 Feb 2009 19:49:54 +0000 Rowan Rodrik http://blog.bigsmoke.us/?p=345 I encountered one of those scans which was shared as a single-page PDF. I don’t want it that way, because I want to include it in a web page. I want a simple bitmap image. ImageMagick comes to the rescue:

convert scan.pdf scan.jpg

If the resolution this produces is too low for you, try telling Ghostscript (which ImageMagick uses internally) that you want a different density:

convert -density 300 scan.pdf scan.jpg

Attribution

Googling linux pdf to jpg produced two useful results:

  1. Batch converting PDF to JPG/JPEG using free software
  2. Converting PDF to PNG/JPG using ImageMagick in Linux
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