Re: SMTPE DPX

For testing I have put some smaller sample dpx files on
http://home.mnet-online.de/svwa/pub/images/
These are linear dpx files with 10 bit and 16 bit depth, RGB and 
Grayscale colorspace.

By the way - is the GraphicsMagick 1.2 branch already available via CVS?
I tried this:
 >cvs update -r GraphicsMagick-1_2 ChangeLog
and got:
 >cvs update: warning: cannot open /GraphicsMagick/CVSROOT/val-tags 
read/write: Permission denied
 >cvs [update aborted]: no such tag GraphicsMagick-1_2

Stefan

Stefan v. Wachter
ALPHA-OMEGA digital GmbH
Munich - Germany

Bob Friesenhahn wrote:

> I have continued to make good progress with DPX support.  DPX is the 
> only supported format I am aware of which supports 10 or 12 bits per 
> sample as part of its standard definition.  Unlike TIFF, 
> GraphicsMagick can support DPX without an add-on library.  As a 
> result, I have included a few DPX files as test input "deep" images.
>
> DPX can optionally support log encoding over a 2.048 density range, 
> which is sufficient to capture the full range of film negatives. Film 
> negatives have approximately linear gain when plotted on a 2.048 
> density log scale.  This can be seen as a form of HDR with minimal 
> resolution loss for film content.  By using a colorspace to postpone 
> the conversion to linear sRGB, the original data is available at the C 
> API level.  This will allow us to support lossless conversion to some 
> other HDR format in the future.  For example, when we add EXR support, 
> then we would be able to convert a log DPX image into EXR format 
> without losing any dynamic range.
>
> Bob
> ======================================
> Bob Friesenhahn
> [email protected], 
> http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
>
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