I see the comb like artifacts all the time with SD and HD 1080 footage when I apply color correction. The histogram shows this very clearly. It's like a quantization error is introduced with certain, maybe all but I haven't checked, color correction adjustments. I'd love to know the real technical explanation for the comb like histograms that are generated while color correcting.
--- In Avid-L2@yahoogroups.com, Michael Brockington <mbrock321@...> wrote:
>
> Wondering if other people are seeing this.
>
> RED clip brought in via AMA.
> RED source settings are: camera metadata, redcolor/redgamma.
>
> Transcoded to 1:1 10-bit RGB (4:4:4) with full debayer settings in Avid.
>
> When AMA clip and transcode are compared, the transcode shows a very
> slight lightening.
> Y-waveform in CC mode confirms a slight lift.
> RGB histogram in CC mode shows a slight rightward shift.
>
> An interesting difference in the RGB histogram -- with the AMA RED clip
> it is a smooth curve, but with the transcoded clip it shows a comb-like
> appearance. As a further test, if the RED clip is transcoded to 1:1
> 10-bit YUV (4:2:2), the RGB histogram still shifts right, but is smooth
> again -- no comb-like artifacting.
>
> Avid project is 1080p, RGB-colour-space
> Avid 5.0.3.5 software only.
>
> --Michael Brockington
>
>
>
>
> [Non-text portions of this message have been removed]
>
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