[Bug 914285] Re: "convert -resize @area" sometimes creates image with incorrect dimensions

[broucaries]

Please mark when reported upstream

** Also affects: imagemagick
   Importance: Undecided
       Status: New

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Title:
  "convert -resize @area" sometimes creates image with incorrect
  dimensions

Status in ImageMagick - Convert, Edit and Compose Images:
  New
Status in “imagemagick” package in Ubuntu:
  Fix Released

Bug description:
  I want to resize a number of images to the resolution of 2200x1650 or
  1650x2200, depending on whether the image is 4:3 or 3:4 (all source
  images are in one of those aspects). I have tried a number of geometry
  specifications and found that the best way to achieve this is to
  specify the pixel count, i.e. 3630000 (2200*1650) pixels.

  However, specifying pixel count of 3630000 sometimes creates a
  2200x1649 image. An example is shown below:

  $ convert -size 2304x3072 xc:white x.jpg
  $ identify x.jpg
  x.jpg JPEG 2304x3072 2304x3072+0+0 8-bit PseudoClass 256c 27.8KB 0.000u 0:00.000
  $ convert -resize @3630000 x.jpg y.jpg
  $ identify y.jpg
  y.jpg JPEG 1649x2200 1649x2200+0+0 8-bit PseudoClass 256c 14.4KB 0.000u 0:00.000

  I would expect a 1650x2200 image to be created.  (Note that the source
  image has an exact 3:4 aspect ratio.)  The bug occurs on 64-bit builds
  of ImageMagick, but apparently not on 32-bit ones.

  A workaround is to specify one pixel more, @3630001, which creates the
  correct 1650x2200 image.

  Version of ImageMagick used for testing is:

  $ convert --version
  Version: ImageMagick 6.6.2-6 2011-03-16 Q16 http://www.imagemagick.org
  Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC
  Features: OpenMP

  In addition to this version, I have also verified that the bug occurs
  in the newer ImageMagick 6.7.4-0 2011-12-13 on 64-bit ArchLinux.

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