#10 Large EXR conversion

1.0.2
closed
darbyjohnston
None
5
2014-10-16
2010-08-30
c haneynyc
No

I am attempting to use djv_convert to add compression to 5k EXRs created with mental ray . It works very well with the smaller images but the 5ks come through with all empty channels - ie black .

I have attempted to use rle , zip , piz and they all have the same results

/djv-0.8.2_linux-x64/usr/local/djv/bin/djv_convert input.exr output.exr -load openexr gamma 1.0 -save openexr compression rle

Here are my system specs :
Linux argon 2.6.18-194.3.1.el5 #1 SMP Thu May 13 13:08:30 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

Discussion

  • darbyjohnston
    darbyjohnston
    2014-10-11

    Hi,

    Sorry for not responding to this originally but I've just released version 1.0 of the software and am trying to close out old issues.

    DJV uses OpenGL for all of its image processing which can impose limits on the size of images that can be used. I suspect that your image may be exceeding the capabilities of the graphics card you are using which is causing the black frame. I've added additional error handling which will try and warn when this happens and will include it with DJV version 1.0.2.

    A potential fix for this issue could be to use a tile based rendering scheme where large images are broken into smaller images that can fit within the available graphics card resources. However this would require a considerable amount of work.

    Darby

     
  • darbyjohnston
    darbyjohnston
    2014-10-11

    • Group: --> 1.0.2
     
  • darbyjohnston
    darbyjohnston
    2014-10-11

    • assigned_to: darbyjohnston
     
  • darbyjohnston
    darbyjohnston
    2014-10-12

    • status: open --> pending
     
  • darbyjohnston
    darbyjohnston
    2014-10-16

    • status: pending --> closed