[magick-users] Results seem OS dependent?

[Anthony Thyssen]

"Eric Moore" on  wrote...
| Hi,
| 
| I'm trying to do a series of operations on a bunch of scanned images.  At
| first I was doing this on a Linux box, but these images are quite large, =
| and
| this box is quite old.  So I figured I'd try this on my windows laptop to
| speed things along.
| 
| The operation that is giving me issues is:=20
| 
| 	convert 23.png -level 75%,100%,0.5 23-level.png
| 
| Presumably this should give the same output no matter where it is run, bu=
| t
| it isn't.  I've uploaded a section of the original image, and the results=
|  of
| the conversion:
| 
| http://www.redtetrahedron.org/23-section-test-original.png
| http://www.redtetrahedron.org/23-section-test-windows.png=20
| http://www.redtetrahedron.org/23-section-test-linux.png
| 
| Any ideas what the problem is? As far as I know the Linux results are
| correct. =20
| 
A number of factors can cause this.
 * The compile time Quality level (Q) can effect quality of the internal
   handling of images (number of bits per color value).
 * It can be version changes.  -level for example was found broken a few
   months ago and was fixed.
 * and finally is can also be the supporting delegate libraries such as
   the PNG library used to write out an image in that file format.
   this is especially the case between UNIX and Window type of OS

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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             Opps. My Brain just hit a bad sector.
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/