[FFmpeg-trac] #2633(undetermined:new): dpx display errors

[FFmpeg]

#2633: dpx display errors
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             Reporter:  mcinquin     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug: commit 5cc5d9d5f7ea2231490d11cf2a28350ebb3f06ab
 introduces small errors in reading DPX.

 How to reproduce:
 1. download
 http://motion.kodak.com/motion/uploadedFiles/Digital_LAD_dpx.zip
 2. ffmpeg -i Digital_LAD_2048x1556.dpx lad.tif
 3. compare the two in DJV, Photoshop or whatever. The 445, 445, 445 square
 has been transformed by FFmpeg into 450, 445, 451

 Bug was introduced by commit  5cc5d9d5f7ea2231490d11cf2a28350ebb3f06ab ; I
 was able to reproduce it on Mac 10.8 & 10.7, and on Debian Squeeze
 Checking out commit just before the bad commit makes the error go away.

 It can seem like a small error, but when you feed the image to a 3D Lut
 now that FFmpeg supports it, the error is multiplied and the colors become
 way off.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2633>
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