Less exposure/more detail with regular VCR than pro S-VHS VCR?
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Hello everyone. I have made an interesting discovery. I found that videos that play back on my VCR/DVD combo unit (Panasonic DMR-EZ37V) actually show more detail in high-exposed areas than my Panasonic AG-1980. Less exposure is shown which actually reveal more detail. I was playing this VCR out of curiosity to compare the picture with my AG-1980. Does anyone know about this kind of thing? Even though the picture may have improved I would still prefer to use my S-VHS VCR because that's what many people suggest in video capturing. Is there a way I can fix the exposure on my Pro unit to match that of my combo unit, or even better?
I have included a couple of example pictures to show you what I mean. |
Actual video files, unprocessed, I think would be preferable.
That being said I see more red color bleeding from the woman’s dress, down on the right side, in the Svhs jpeg. |
There are trim-pots insinde the VCR that adjust the Y level, though I woudln't recommend messing with them unless you know the level is higher than it's supposed to be. You should be able to adjust the level on the capture card side (or tbc). The AG1980P does also have some image settings to adjust sharpness and noise reduction - probably someone that uses these can fill you in on how to set it.
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My TBC (AVT-8710) won't correct the levels in a way that more details show up. Adjusting the levels on that only brightens/darkens the picture, nothing else. Same thing with levels in software (VirtualDub). The problem lies within the VCR (those trimpots you were talking about). Is it easy to access them so I wouldn't damage the VCR (AG-1980)?
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What capture card are you using with the AG-1980? In VirtualDub you need to adjust brightness and contrast so the video levels fit within the blue area of the histogram. Does that fix the overexposure?
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What i notice from these pictures, is the inperfection of the vertical lines, at one picture....
which means the video signal is too strong ? I guess you should go for the combo, and move on, i've seen worse captures.... |
It looks like the TBC in the AG1980P is off at least.
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You could also use the Intensity Shuttle with the Panasonic DMR-EZ37V because the Panasonic DMR-EZ37V has also component video output, which you also can switch to progressive output, check the manual for this.
This way you can set (the capture) video levels in the video setup driver settings, or in post with Davinci Resolve, works perfect. (the DMR-EZ37V already gives a better and clean video signal output, it looks very much alike the DMR-ES35V) btw. you did not tell which capture device you use, it's important :) |
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de-interlacing will always give less detail, anyway ? A side effeect of component progressive output is also, that it removes Macrovision (if present on tape) i noticed. |
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I have already tried adjusting the brightness and contrast, as well as putting it in range of the histogram, and that doesn't work. Quote:
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It makes no sense. :question: :screwy: |
If you're grabbing the processed output from a DVD-Recorder it may give a marginal quality improvement over S-Video, especially for PAL as it would avoid doing vertical chroma smoothing done in PAL a second time by the capture card. It may evade macrovision, or may make it worse, as component doesn't support all forms of macrovision. Granted, DVD-recorders tend to screw up the image when seeing copy protection in any case.
The raw video on vhs (and video8,betamax etc) is Y/C and not component so any component output will have had to go through a chroma decoder, and most likely a digitization step. |
I think I found out why the combo shot is less exposed than the SVHS one, and if so there is no problem at all with my pro unit. I had captured test shots of the same scene with both units. The thing is, when I advanced each test shot frame by frame to the subject presented in this post, I tried to match to the exact frame on both shots, but actually couldn't match them to a tee. It's a movement shot, so the exposure/details fluctuate as I move. Since both frames are not at the exact location of the shots, the exposure is a tad different between each frame. I just tested this out and found it to be true.
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As noted way back in post #2, we need short, unprocessed video samples attached.
As hodgey said, the AG-1980 line TBC appears to be turned off in the post #1 screenshot. Or it's not working properly. Quote:
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Here attached is the capture I did today. The painting shot I got the snapshots from is at the very end. |
The sample does indicate clipping is happening before the capture card. What was the workflow used for the capture? If it was AG-1980 direct to capture card, then the VCR is clipping the bright parts of this tape internally.
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