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  #1  
Old 08-19-2012, 01:55 PM
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Interlacing destroys color

I know this is going to sound weird, but I have noticed that interlaced programming seems to have worse color qualities than a non-interlaced signal (like 240p for example).

I know in the signal itself, it's the same.. On an LCD or plasma, they look the same in color.

But on a CRT, it seems color quality on a interlaced signal is just, different. ALL CRT's I have used or seen (including my friends roundie), exhibit this same thing.

Unless of course it's just me.

(EDIT: Whooops! Wrong board! Sorry.)
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Old 08-19-2012, 07:30 PM
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What's with the "whoops?" Did this get moved here from the wrong place or has it been moved from here to somewhere else?
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Old 08-19-2012, 08:07 PM
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I accidentally posted it here in the broadcasting gear board.. I don't think it actually belongs in this board but perhaps a different board.
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Old 08-19-2012, 08:44 PM
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Well, how about Television Broadcast Theory then?
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Old 08-19-2012, 08:49 PM
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That'd be fine, but I don't have the authority to move posts.
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Old 08-19-2012, 09:03 PM
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I think you may have capability to remove your own post. You could see if it works, then you could repost in the other forum.

Meanwhile, maybe a mod can move it.
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Old 08-19-2012, 09:05 PM
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No thread deleting capabilities for me.

So a mod will need to move it for me.
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Old 08-19-2012, 09:07 PM
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Well, I see it's copied over, so on with the discussion!

Could you explain a little more what you mean? Are you talking about the same program viewed as interlace and as progressive scan? On the same TV or separate TVs?
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Old 08-19-2012, 09:14 PM
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Same program, same TV.

I've noticed this for all TV's.. Basically, even on a color bar generator that allows both interlaced and non-interlaced, at least to my eyes, I've noticed that the color bars look better when non-interlaced/progressive scan.

I don't know if it has to do with the phosphors in a line getting 1/2 less the beam or what, but it just seems the colors seem more dull (or darker).

It could though very well be just my imagination.
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Old 08-19-2012, 09:17 PM
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I don't understand how you are looking at both interlace and progressive on a roundie, which can only display interlace?

Edit: oops - i see now you aren't talking about 525 (480) progressive, but 240 progressive.

I'm surprised that you see any color difference, although you could see some inter-line flicker (or "twitter") in the interlaced case.

Last edited by old_tv_nut; 08-19-2012 at 09:21 PM.
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Old 08-19-2012, 09:25 PM
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CRT phosphors decay within one scan field (except for some low level persistence), so the two cases should appear the same brightness and color to the eye.

The two cases definitely will be different for a well focussed camera shot, however. The average brightness is the same, but the line-paired (progressive) case means the photo has to try making the same average brightness from a combination of overexposed scan lines and black spaces. The visual system has separate processing for average brightness and detail and doesn't saturate on the progressive scan lines the way a camera does.
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Old 08-19-2012, 09:29 PM
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Another thing - many analog sets have imperfect interlace such that line pairing will come and go as you adjust vertical hold slightly. It would be interesting to perform this experiment and report what you see as interlace comes and goes.
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Old 08-19-2012, 09:32 PM
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And another question - does the effect depend on how closely you view the screen?
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Old 08-19-2012, 09:52 PM
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Doesn't seem to affect viewing difference, but I usually view within 10ft.
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Old 08-20-2012, 09:57 AM
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Are you seeing the line structure more (brighter lines separated by darker spaces) in the non-interlaced case?
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