Tiff export causes red pixel error, DPX is good

[Sebastian Cramer]

I was trying to export various scenes today from a commercial shoot. The tiff export caused some very ugly red pixels in the green screen background. DPX export was ok and then used. RedCine 3.1.2 on Macpro 8core 3GHz, latest version of Leopard.

First image is showing the DPX out, second the same image as Tiff.

Any ideas? Has someone seen something similar?

Thanks,
Sebastian

 

[Lucas Wilson]

I was trying to export various scenes today from a commercial shoot. The tiff export caused some very ugly red pixels in the green screen background. DPX export was ok and then used. RedCine 3.1.2 on Macpro 8core 3GHz, latest version of Leopard.

First image is showing the DPX out, second the same image as Tiff.

Any ideas? Has someone seen something similar?

Thanks,
Sebastian

Are you exporting 8- or 16-bit TIFFs?

Lucas
------
ASSIMILATE, inc.
LA, CA, USA

 

[Sebastian Cramer]

Hi Lucas,
I was originally exporting in 16 bit and later the day I was doing the same in 8bit. Both had this effect.

 

[Ido Karilla]

Hi Lucas,
I was originally exporting in 16 bit and later the day I was doing the same in 8bit. Both had this effect.

32 bit resolved the issue for me.

 

[Sebastian Cramer]

Does this mean you have had these red pixels yourself? Phehh... 32bit, that makes it all even larger and other than the image might be clear I don't see any benefit in going so high. Any suggestions, Lucas or someone else?

Thanks,
Sebastian

 

[John Tissavary]

32 bit resolved the issue for me.

Could be that the pixels are 'wrapping'? That's when you have a pixel whose value exceeds the bitspace, and rather than clipping at white it wraps back to zero plus the leftover value.

I've not seen that in Scratch / RedCine, but I have in Nuke and other compositing packages.

cheers,

John T.

 

[Sebastian Cramer]

Thanks John,
any workaround here? Or simply go the DPX route until the issue is fixed in RC?