Computer Monitor Progressive vs. HD progressive

OK, so we all know that if a project is going to be broadcast, you have an NTSC monitor set up when you're editing, right? Because the computer monitor is a progressive display, it isn't the best when it comes to color correction or interlacing/deinterlacing issues (as seen in many a thread here when people say "XXXX looks really bad when I see it in the canvas" only to have someone say "Have you looked at it on a TV or NTSC monitor?). So we're all in agreeance (is that even a word?) that computer monitors (LCDs like the Apple's Cinema Display) are not the best to view this stuff, right?

That said, how come all HD televisions (smaller than 52 inch plasmas) are LCD progressive? Isn't that just like watching something on a computer monitor?

Just wondering.

Jonathan

Power Mac G5 2.0, Mac OS X (10.4.8), 1GB RAM, FCP 5.1.2 (Studio), nVIDIA GeForce 6600, Canon XL2

Posted on Dec 1, 2006 4:11 PM

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4 replies

Dec 1, 2006 4:45 PM in response to 8Lincoln30

agreeance = agreement, as in: We're all in agreement on that issue.

Aside from interlaced vs. progressive, the main difference between CRT TV monitors and computer monitors (of any type) is the color space, depth and gamma. That's what makes a computer monitor a poor choice for color grading a program meant to be viewed via TV (broadcast or otherwise).

-DH

Dec 1, 2006 5:52 PM in response to 8Lincoln30

Progressive plasma and LCD TV's have powerful de-interlacers built into them, they effectively take the 480i60 image and upscale, and interpolate it into a 480p60 image, in real-time, there is a delay in the picture because of this, and the sound has to be delayed to match - it is quite noticeable when playing rhythm action games on consoles (like Guitar Hero).

Some do it better than others, and some don't do it at all (discard 1 field to make a 240p30 image, and blend).

The same is true of 1080i60 images being turned into 720p60 or 1080p60 by HDTV's, again, some do it badly, or not at all.

What I do on a computer, is use compressor to take i60 sequences and use the advanced format conversion to set the frame controls up to create a p60 sequence, for viewing on a monitor. It takes a long time to do, but looks pretty decent, and still maintains the fluid movement I expect from video (60 updates per second).

For instance, taking 1080i60 HDV and making 720p60 DVCProHD seems to work quite well.

Dec 4, 2006 9:41 AM in response to David Harbsmeier

OK, I understand the interlaced vs. progressive, David, but the HD TVs are not CRTs...they are LCDs...as are computer monitors. Maybe I'm still not getting this, but am I wrong in saying that HDTVs are just big computer monitors because they are both progressive? So if we're saying computer monitors (progressive) are not a good judge of what the picture should be, why are HDTVs progressive?

Sorry if I'm a bit slow on this...

Jonathan

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Computer Monitor Progressive vs. HD progressive

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