Re: [GM-help] dpx format questions

[Bob F. <bfr...@si...>]

On Mon, 3 Apr 2006, Bob Friesenhahn wrote:
>
>> 2 - what about overriding the 95 black point 685 white point  1.7 gamma 
>> settings  [which I assume is what the "cineonlog" colorspace is encoding]?
>
> This is a current weakness in GM.  These may be altered by adjusting 
> attributes with a C or C++ program (using the GraphicsMagick library) but 
> there is not currently a command line way to adjust these attributes.  They 
> are not hard-coded, but they are also currently not adjustable except for 
> from a program.

I should clarify this a bit.  The current adjustable attributes are 
"reference-white", "reference-black", "display-gamma", and 
"negative-film-gamma".  These are in the global attribute space (not 
prefixed with "DPX:".

I see that there is currently a bug in that these attributes effect 
the Cineon log<==>linear transformations but the values are not 
properly saved to, or loaded from, the DPX file header,

Bob
======================================
Bob Friesenhahn
bfr...@si..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/