Ok so whats going on here then?
3 sequences in FCP
1, uncompressed 10bit
2, Prores422HQ
3, Prores4444
Add HD colour bars to each. Export the bars as QT (same format as seq) Then reimport. Whats with the 4444 one?
From the Apple white paper I gather ProRes4444 can be RGB or YUV. But FCP is YUV. So the bars must be YUV as the app generating them is YUV? If the built in bars are orig 8bit why would upsampling them cause this? see the black line between the bars.
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