Re: DPX Support

On Wed, 6 Apr 2005, Robin Rowe wrote:

> Bob,
>
>> I have been working on SMPTE DPX support.  SMPTE DPX is a format normally 
>> used to store frames for movie and video production and is rarely seen in 
>> the "wild".
>
> There are millions of frames in the wild, just not on the Internet. The only 
> images outside are the Kodak DLAD test image and the frames at my site 
> DigitalFilmLibrary.org. I'm getting more images, but it takes time.

I have the "Tom Tight" frames but these are original Cineon, not DPX. 
They seem to be linear rather than log format.  At least they look the 
same in CinePaint and GraphicsMagick.

The Kodak DLAD test image is also Cineon rather than DPX and is also 
linear rather than log scaled.

If you can obtain the frames for "Finding Nemo" or "Star Wars", that 
would be great. :-)

>> DPX log formats are not supported yet and only linear RGB and grayscale 
>> are supported.
>
> DPX 10-bit color log is what's typically used.

Right.  Supporting log format should as simple as inserting 
translation tables based on the Kodak documentation.

At the moment, the DPX encoder chooses an output which is most 
"suitable" based on the depth of the input image.  So if the input 
image was 8 bit, then the output DPX would be 8 bit.  There are 
specific options for controlling the depth and packing format.

It may be that outputting 10-bit by default is best in order to 
enhance interoperability.  Or maybe there should be a specific option 
for this in order to ensure that all the parameters are ideal.

Bob
======================================
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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