Re: Re: Linuxmovies-general digest, Vol 1 #217 - 8 msgs

On Tue, 27 Dec 2005, salsaman wrote:
> Hi Bob,
> that is not strictly true, although LiVES is currently aimed at home users.

Salsaman, I did not mean to criticize LiVES in any way.  Certainly 
different types of productions have different reqirements, and being 
able to edit video at home is a quite useful application.  It would 
not make sense to burden this sort of user with a cumbersome 
framework.

The reason why I asked about a DI framework oriented toward 
studio-grade production is because I have not heard of an open-source 
framework which supports these requirements.  An open-source framework 
would be quite useful.

An example of a successful open-source framework is eclipse 
(http://eclipse.org/) which is a framework for building software, and 
is now strongly supported by many significant companies.  These 
companies are discarding their existing proprietary environments and 
are offering smaller add-ons to eclipse instead.  The file-based DI 
process needs an industry-supported open framework like this.

> Second, for colorspaces, if you look at the current spec for LiVES realtime 
> processing:
> http://www.xs4all.nl/~salsaman/lives/docs/weedspec.txt
> you will see that one of the supported palettes is RGBA float (packed 32bit 
> float giving a 128 bit pixel size) which should be adequate for any future 
> use.

16-bit samples are more than sufficient to support any 
editing/post-production requirement. 13-bits linear or 10 bits log, 
are sufficient. Only the rendering/HDR folks want more than 16-bits.

Professional-grade video is still limited to 10-bits linear.  The only 
exception to this are cameras which output using 10-bit log encoding 
(e.g. Viper).

> The reason this palette is not used so much now:
> - there are no readily available sources for such image formats
> - AFAIK there is no intermediate image format for such frames

One format which can be easily used is TIFF.  TIFF supports 32-bit and 
64-bit floats, and Photoshop CS2 has introduced (draft documented) 
support for 16 and 24-bit floats in TIFF.  There is the possibility of 
using OpenEXR or other HDR formats.  DPX can also support 32-bit 
floats although I don't know of any applications supporting it.  The 
FITS format (for astronomy applications) supports floating point 
images.

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


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