This was exported from smoke 2013 ext1. The original source files where 16bit tiff files, the clip at the end was R3D (Red Color 3, Red Gamma 3) converted to 16bit DPX files and brought into smoke.

My process for this clip was to export quicktime prores 4444 with NO YUV Headroom. The next step was to export a 1280x720 H.264 clip from quicktime pro, with the default setting selected.

Conclusion: There were no noticeable gamma shifts in either the 4444, or the H.264 versions while viewing in Quicktime. However there was a slight gamma shift once vimeo uploaded and "compressed" it.

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