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HP Dreamcolor 27x and monitoring interlace video

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John McMullin
HP Dreamcolor 27x and monitoring interlace video
on Apr 20, 2017 at 10:53:09 am

I'm posting this in the grading section for want of a better section although it's really a monitoring issue.

I'm looking to purchase the Dreamcolor 27x monitor to work with Adobe Creative Cloud. I'm working with a client and we have to deliver ads in 50i, both at 1080 and SD PAL. The camera sources are progressive but we have to deliver for Adstream at 50i.

The way I'm doing this is to change the sequence settings to top field interlaced and then export via Adobe Media Encoder to the desired formats. This will change the dissolves and transitions etc to interlaced which is OK, but it will also introduce interlacing to any speed affected footage (footage shot at 50fps and speeded up 200%). We want to retain the progressive look on the actual camera source footage. I can deinterlace these shots no problem but currently we cannot monitor or see these artefacts properly during the QC process.

So I've looked at the Dreamcolor specs and it says that it accepts an interlace signal, but what I can't determine is whether it actually displays the interlace correctly.

Many thanks for your help,

John


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Jeff Pulera
Re: HP Dreamcolor 27x and monitoring interlace video
on Apr 20, 2017 at 2:07:19 pm

Hi John,

Not an expert on this workflow, but if all sources are Progressive, why not edit as Progressive, then just export as Interlaced in the end?

Also, how do you plan on getting an interlaced signal out to the monitor? I believe you will need a Black Magic card or similar, as the computer graphics card is not going to output interlaced footage. Decklink Mini Monitor for instance.

Thanks

Jeff Pulera
Safe Harbor Computers


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John McMullin
Re: HP Dreamcolor 27x and monitoring interlace video
on Apr 20, 2017 at 9:03:52 pm

Thanks Jeff,

Yes. I was recommending buying a Ultrastudio 4K for the outputs.

The client is an agency that previously finished in a post house before but now want to finish in-house. I managed to get the first batch of ads through but was frustrated by the basic monitoring. Didn't even have proper speakers. So I'm trying to put together a budget kit list for them.

I could finish everything as progressive and then convert the format to 50i later as a separate encode. But I prefer to export directly from the final sequences as it cuts out a step. Also, I like the transitions/fades being interlaced as they look less jerky on TV that way.

Aside from the specifics of this job, I'd really like to be able to monitor interlaced as it's always a pain somewhere later on down the line if you can't. Other option is to put a small interlaced monitor on a second video output.

John


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Jimmy See
Re: HP Dreamcolor 27x and monitoring interlace video
on Sep 25, 2018 at 3:36:06 am

Hey, I'm sure you already figured something out, but I wonder if you have an update on what you discovered and if you got anything definitive.

I have reason to believe that the dreamcolor monitor does NOT display a true and correct interlaced signal. I have discovered this while attempting to check over a timeline in DaVinci Resolve before rendering out for finishing and export for broadcast.

One thing that is a consistent issue at this stage on many projects I've worked on is Drone footage, especially high resolution 4K drone material. On this project, I had my monitoring mode set to PsF and on broadcast the program will be interlaced. Since all the source material is filmed progressive, PsF should work as an accurate depiction of what the program would look at broadcast I thought. Looking at things in this mode I was surprised by the LACK of issues with the drone footage and happy there wouldn't be need to try and compensate with blurring. However, just to be extra sure, I set the monitoring to interlaced. All of a sudden the drone material looked like it was SD, it was blurry and also chock-full of the usual drone issues of aliasing and moire patterns all over the frame. I was freaking out but actually, as the dreamcolor is not a real broadcast monitor I think what's happening here is that it will accept an interlaced signal by virtue of processing it to make it progressive, I assume it's probably de-interlacing using some kind of line doubling. This would explain why everything looked like crap in interlaced mode. Presumably a PsF signal is somehow interpreted as a progressive signal and the monitor has no issue. This leads me to believe the DreamColor doesn't show interlaced correctly, but if you got any definitive answer since you posted this it'd be good to know.


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