Re: [Openexr-devel] Re: How to compress images using B44 compression

[Sebastian Elsner]

If I remember correctly you just set the output file header's compression  
information to B44 and write the image to disk.


On Fri, 04 Jun 2010 08:08:49 +0200, Shantanu Daithankar  
<address@hidden> wrote:

> Anybody out there who has the remotest clue about how I am supposed to  
> get
> images compressed using B44 compression through my C++ code?
>
> Any help will appreciated.
>
> Shantanu
>
> On Tue, Jun 1, 2010 at 11:12 AM, Shantanu Daithankar <
> address@hidden> wrote:
>
> > Hi,
> >
> > Can some one please tell me about how and at what point the B44  
> > compression
> > of an image takes place? I have searched online and have not found  
> > anything
> > clarifying this matter including the docs. I'm currently under the
> > impression that the only thing I can do to accomplish this task is
> > specifying the particular compression flag in the header that is  
> > generated
> > while saving an exr image. And could I also know if there are any  
> > libraries
> > out there that will enable me to compress an image using the B44 method  
> > in
> > C++.
> >  What I am trying to do is use a sequence of frames to play a video
> > directly from the disk(like 'playexr') where the frames are in dpx  
> > format.
> > Thus I need to convert the images into B44 compressed exr's and use  
> > them to
> > play the video. I used ImageMagick for the conversion but I have not  
> > been
> > able to compress them because for some reason, IM will not compress  
> > them in
> > spite of using the correct commands and their error free execution.
> >
> > - Shantanu


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