I'm going a bit crazy with capturing the correct chroma and hue levels from VHS.:confused: My goal with this is that I want to ensure that I am capturing all the correct Chroma and Hue that I can from my VHS tape. I've gone through a lot of threads, and find A LOT of discussion on luma (the Y component) and getting the luma levels correctly captured to the capture card but not much on chroma (the UV component). I thought I would give Chroma and Hue some attention. :D
For what I say here below, let's assume the HUE levels are correctly adjusted prior to capture to digital:
However, what it seems to me (please correct me if I am wrong), that the Chroma sort of piggy backs of the luma levels. In other words, as long as I ensure my luma levels are correct, then my Chroma levels would also be correct as long as I have captured 'some' chroma. So all I need is a little chroma to determine
To me, chroma reflects the saturation of color. If there is no chroma, then there is no color (it's a black and white picture).
However, having captured 'some' chroma, I then have enough information encoded to digital I would believe. This leads me to think that trying to capture correct cromma levels is irrelivent. Why? Because, it seems I can simply correct the chromma levels in POST production (i.e. correcting the chroma in the digitally captured video)? Yes? No?
Chroma consinsts of U and V where U and V are blue–luminance and red–luminance differences from Y (luma), correct? So as long as I have recorded some blue-luminance (the U component) difference from Y (luma) and red-luminance (the V component) from Y (luma), then the COLOR is essentially captured. Is the Chroma level correct (i.e. the saturation) upon capture from VHS? I would think: who cares! Because, in post production (from the digitally captured video) I can adjust the Chroma level (i.e. saturation) which would be as equivillent to if I adjusted the Chorma levels (say through a hardware proc amp) prior to the capture to digital video. Right? Is that the correct understanding? Or am I missing something.
So this assumes, the HUE is correct upon captured.
Now let's look at HUE:
To me, which I could be wrong, correct Chroma and HUE are two separate things. But, assuming I had the correct Chroma levels correct prior to capturing video, wouldn't I also be able to correct the HUE in post production as well?
My point is this: the most important part of capturing VHS to digital (assuming I have the best VCR, best TBC, ...etc), is making sure the luma levels are correct when capturing to a capture card (assumes a properly calibrated capture card too). And, that I have captured some of the UV component of the VHS to know what the color is for the video. Capturing the correct luma and some of the UV component, I've essentially sucked everything off the VHS tape. Is this correct? Or where am I going wrong?
I kept reading everywhere, capture the right chroma levels. But, the question I kept asking is, what does that even mean to capture the correct chroma levels? :confused:
In summary:
For what I say here below, let's assume the HUE levels are correctly adjusted prior to capture to digital:
However, what it seems to me (please correct me if I am wrong), that the Chroma sort of piggy backs of the luma levels. In other words, as long as I ensure my luma levels are correct, then my Chroma levels would also be correct as long as I have captured 'some' chroma. So all I need is a little chroma to determine
To me, chroma reflects the saturation of color. If there is no chroma, then there is no color (it's a black and white picture).
However, having captured 'some' chroma, I then have enough information encoded to digital I would believe. This leads me to think that trying to capture correct cromma levels is irrelivent. Why? Because, it seems I can simply correct the chromma levels in POST production (i.e. correcting the chroma in the digitally captured video)? Yes? No?
Chroma consinsts of U and V where U and V are blue–luminance and red–luminance differences from Y (luma), correct? So as long as I have recorded some blue-luminance (the U component) difference from Y (luma) and red-luminance (the V component) from Y (luma), then the COLOR is essentially captured. Is the Chroma level correct (i.e. the saturation) upon capture from VHS? I would think: who cares! Because, in post production (from the digitally captured video) I can adjust the Chroma level (i.e. saturation) which would be as equivillent to if I adjusted the Chorma levels (say through a hardware proc amp) prior to the capture to digital video. Right? Is that the correct understanding? Or am I missing something.
So this assumes, the HUE is correct upon captured.
Now let's look at HUE:
To me, which I could be wrong, correct Chroma and HUE are two separate things. But, assuming I had the correct Chroma levels correct prior to capturing video, wouldn't I also be able to correct the HUE in post production as well?
My point is this: the most important part of capturing VHS to digital (assuming I have the best VCR, best TBC, ...etc), is making sure the luma levels are correct when capturing to a capture card (assumes a properly calibrated capture card too). And, that I have captured some of the UV component of the VHS to know what the color is for the video. Capturing the correct luma and some of the UV component, I've essentially sucked everything off the VHS tape. Is this correct? Or where am I going wrong?
I kept reading everywhere, capture the right chroma levels. But, the question I kept asking is, what does that even mean to capture the correct chroma levels? :confused:
In summary:
- Luma (Y component) - very important to get levels correct when capturing to your video capture card
- Chroma (UV component) - as long as you have captured some of the color information, the correct Chroma and Hue adjustments can be performed in post production (i.e. after the analog VHS video has been already captured to digital)