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re: Red Text aliases after converting from 1080 23.98 to DVCPROHD 72060

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Chad Tingle
re: Red Text aliases after converting from 1080 23.98 to DVCPROHD 72060
on May 23, 2011 at 7:57:10 pm

I am using apple compressor to convert a spot that is in an apple pro res 1920 x 1080 23.98 sequence to a DVCPROHD 72060 quicktime file for a local station. The video and most of the text look perfect but I have a portion of the client's logo that is in RED with a black stroke and the red seems to be aliasing. Is there anything I can do within apple compressor to reduce this. I've attached a screen shot from the finished DVCPROHD quicktime file.



Thanks

Chad Tingle
Producer/Editor


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Craig Seeman
Re: re: Red Text aliases after converting from 1080 23.98 to DVCPROHD 72060
on May 23, 2011 at 8:15:07 pm

Red is one of those difficult colors. You may need to lower the chroma or red specifically in the original spot. Have you looked into whether the station will accept an MPEG2 Program or Transport stream instead of going to the DVCProHD codec?



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Chad Tingle
Re: re: Red Text aliases after converting from 1080 23.98 to DVCPROHD 72060
on May 23, 2011 at 8:14:01 pm

Craig,

thanks fo the quick response. The station will not accept MPEG 2 but I do have other stations that will. I have a station that wants a 35 mbit mpeg 2 file and I get the same results. Is there something different that you do when making an MPEG 2 transport stream that reduces aliasing on red text?

Thanks

Chad Tingle
Producer/Editor


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Craig Seeman
Re: re: Red Text aliases after converting from 1080 23.98 to DVCPROHD 72060
on May 23, 2011 at 8:25:12 pm

MPEG2 streams can be either 4:2:0 or 4:2:2. Choose the latter if such were compatible with the station. Again the issue may be the red chroma itself. It tends to be a problem. You may need to look at it on scopes and may need to target the color and bring it down in the original spot. That you're only seeing the problem in that color is indicative.



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