Superwhite

[Topher Welsh]

I am not sure what you mean by superwhite but i know there is a gamma shift problem with quicktime when you are rendering out videos… check out Andrew Kramer’s post here:

https://www.videocopilot.net/blog/?p=197

it deals with something that might be able to help…

sorry if it doesnt though…

Toph.

Topher Welsh
Head Editor & Motion Graphics
Emerald Downs Horse Racing
Television Department

[Jeff Dugal]

Thanks,
By superwhite I mean white above 100 IRE.

I digitized a clip in HDTV Uncompressed 10 bit via a Kona 3 card (Apple Uncompressed 10 bit 4:2:2 codec). This clip have superwhite (white above 100 IRE).
Export quicktime movie current settings.
Then importing it in AE.
After effects project setting 8 bits (or I even tried 16 bits) with no color management.
I render it in 1920×1080 (Codec Apple Uncompressed 10 bit 4:2:2).
Then going back to FCP, every color and levels (black and luma) is exactly the same except there is nothing above 100 IRE.
I tried reimporting the original clip directly into FCP and the superwhite is still there (means After effects is clipping “superwhite”).

[Dave Fraser]

Hiya, not 100% sure i can help, but i remember watching a tutorial a little while ago about using 16bit or 32bit colour. it pushes whites further then 255 and blacks below 0, not sure if it’d work on a solid mind, but maybe worth looking into.

hope this helps.

Dave Fraser
Motion Graphics Artist
Big Button Media LTD
http://www.bigbutton.tv

[Jeff Dugal]

thankf, I already tried in 16 bits and 32 bits … doesn’t work.

[Darby Edelen]

The only way that I can conceive of it working is in 32bpc with color management enabled using the HDTV (Rec. 709) working profile and rendering to a non-RGB codec. I’m still not sure if it works, but it’s the only way I would expect it to… although there may be other color management methods that would?

Darby Edelen
Lead Designer
Left Coast Digital
Santa Cruz, CA