[Bf-committers] cineon/dxr support in Blender

[Ton Roosendaal]

Hi,

The trip to the HD studio was very succesful! They got a Quantel system  
there, which will read our files to be able to put it on a HDCam SR  
tape (seems to be the best quality format for our premiere, its  
1920x1080 pixels and 10 bits/component color).

The Quantel didn't like the blender-saved cineon files, with error  
"Invalid image offset"... whatever that means. But the DPX files went  
OK. Even when only 10 bits/component, the improved color range was just  
beautiful. The studio had some super expensive HDTV/film monitor there,  
and we've been staring totally amazed for almost 2 hours at how great  
the movie stills look. :)

-Ton-

On 2 Mar, 2006, at 11:35, Joe Eagar wrote:

> Joe Eagar wrote:
>> Ton Roosendaal wrote:
>>> Hi,
>>>
>>> Oh, that's cool! :)
>>>
>>> Afiak, Cineon is per-definition film-scanner format, and requires  
>>> this logarithmic mapping to black and white, also allowing deeeep  
>>> black and ultra white colors. Probably the cinepaint code has the  
>>> formula for conversion from float (0-1) range to cineon range?
>>>
>>> DPX is a generic format, which can also write 16 bits/component. For  
>>> dpx, linear mapped colors should be possible too.
>> Actually the exporter library took 16-bits-per-channel unsigned  
>> shorts as input, so I had to do some conversion.  I took some test  
>> files into cinepaint to make sure I did it right, and it works.
>>
>> What worries me is whether or not the endian-switching code works;  
>> the dpx/cineon import/export library I took from cinepaint's  
>> cineon/dpx plugin uses tcp/ip endian switching functions, and I  
>> frankly have no idea if the cinepaint developers have made sure it  
>> all works or not.
>> joeedh
>> _______________________________________________
>>
> I posted a patch tarball to the tracker at  
> http://projects.blender.org/tracker/index.php? 
> func=detail&aid=3972&group_id=9&atid=127
>
> To use, just unzip the tarball inside the blender/ dir (not below it)  
> and apply the cineon.patch patch file.
>
> Files I changed are:
> - writeimage.c (in imbuf) -- added hooks to the cineon/dpx saving  
> functions.
> - image.c (in blenkernel) -- added automatic extension appendage, and  
> added the line needed for saving.
> - buttons_scene.c (in src) -- added to render output menu there
> - DNA_scene_types -- added typed R_CINEON and R_DPX
> - IMB_imbuf_types (in imbuf) -- added CINEON and DPX as format types,  
> with bitmasks 21 and 20 respectively.
> - source/blender/imbuf/intern/Makefile -- added cineon subdir.
> - source/Makefile -- added linking stuff.
>
> I added a cineon dir in imbuf; outside of the cineon dir the only file  
> I added was IMB_dpxcineon.h (which I placed in imbuf where it  
> belongs).
>
> since all needed code is included, I opted to not got through the  
> trouble of putting everything in #ifdefs.  I went through the code  
> with -pedantic set and removed all warnings.
>
> joeedh
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>
------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton at blender.org  
http://www.blender.org