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Old 14th February 2011, 05:51   #1  |  Link
Hyper Shinchan
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Colour comparison between BDs and DVDs

I suppose that this is a general (and newbie) enough question:
I've been discussing about the colour of DVDs compared to the colour of BDs on an other, not A/V dedicated, board; as far as I can tell BD uses the same space colour (YUV 4:2:0), bit depth (8 bit) and colour matrix (usually Rec.709) used by DVD; if that's true then the only gain could be possible because of the improved codec efficiency and maximum bitrate.
Is there something else that I'm overlooking?
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Old 14th February 2011, 07:02   #2  |  Link
Blue_MiSfit
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Well, not really..

If you're doing a BluRay release, you need an HD Master. You may or may not have used one for doing a DVD release. If the same master is used, the colors will be quite similar. If a new master is generated (i.e. a new telecine / film scan), it's quite possible that the look will be different.

There's nothing about HD that makes color "better". It's all still 8 bit 4:2:0, which (when done properly) is basically transparent to 4:4:4 / RGB in most cases. 10 bit would be nice though...

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Old 14th February 2011, 10:04   #3  |  Link
Ghitulescu
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Quote:
Originally Posted by Hyper Shinchan View Post
Is there something else that I'm overlooking?
Yes, the DVD uses REC 601 not 709.
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Old 14th February 2011, 10:12   #4  |  Link
SeeMoreDigital
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Given more and more Blu-ray releases also come packaged with a DVD version of the same movie... How about you just compare the two
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Old 14th February 2011, 13:52   #5  |  Link
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Quote:
Originally Posted by Ghitulescu View Post
Yes, the DVD uses REC 601 not 709.
So does that mean the colors of a movie on a DVD must look different to the same movie on BluRay?
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Old 14th February 2011, 14:54   #6  |  Link
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So does that mean the colors of a movie on a DVD must look different to the same movie on BluRay?
Ignoring edge cases and rounding errors no, but it will mean if you use rec709 co-efficients on DVD video you will not get the colors as intended.

Last edited by GodofaGap; 14th February 2011 at 14:58.
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Old 14th February 2011, 17:03   #7  |  Link
yetanotherid
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Ignoring edge cases and rounding errors no, but it will mean if you use rec709 co-efficients on DVD video you will not get the colors as intended.
Cheers. I was just kind of curious as to whether the answer had anything to do with the question asked.
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Old 14th February 2011, 17:10   #8  |  Link
Ghitulescu
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Cheers. I was just kind of curious as to whether the answer had anything to do with the question asked.
The question itself contained a false assumption.

All the answers are however correct, insofar the unclarity has been removed.

Watching a DVD on a SD chain should correctly display the colours. The same goes for a BD (with HDTV) on a HDTV chain, too. If one watches SD on a HDTV chain or HD on a SD chain* (or equivalent) it's the sole responsibility of the player to convert not only the definition but also the colour space according to the displaying device.

*like SD outputs of various HD players and SAT receivers.
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Old 14th February 2011, 17:23   #9  |  Link
yetanotherid
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Quote:
Originally Posted by Ghitulescu View Post
The question itself contained a false assumption.

All the answers are however correct, insofar the unclarity has been removed.
Ah yes.... I see the error of my ways now.
I missed where the original question included the assumption that both DVD and BluRay use Rec 709.

Dumb, dumb of the thread award goes to me....
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Old 15th February 2011, 02:32   #10  |  Link
Hyper Shinchan
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First of all thanks for the replies.
Quote:
Originally Posted by Blue_MiSfit View Post
If you're doing a BluRay release, you need an HD Master. You may or may not have used one for doing a DVD release. If the same master is used, the colors will be quite similar. If a new master is generated (i.e. a new telecine / film scan), it's quite possible that the look will be different.
Yeah, I was referring to a comparison made using the same source.
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Originally Posted by SeeMoreDigital View Post
Given more and more Blu-ray releases also come packaged with a DVD version of the same movie... How about you just compare the two
Do you mean packaged together? No, all BDs that I own don't have a DVD packaged together, most of them have been released separately on DVD as well but I don't own those editions.
Quote:
Originally Posted by Ghitulescu View Post
Yes, the DVD uses REC 601 not 709.
Thank you for the correction; GodofaGap mentioned something about edge cases and rounding errors, could anyone explain something more about it?

Last edited by Hyper Shinchan; 15th February 2011 at 02:59.
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Old 15th February 2011, 10:08   #11  |  Link
SeeMoreDigital
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Quote:
Originally Posted by Hyper Shinchan View Post
Do you mean packaged together? No, all BDs that I own don't have a DVD packaged together, most of them have been released separately on DVD as well but I don't own those editions.
Yes... From memory, my Blu-ray versions of Sherlock Holmes, Avatar and Blade Runner all came with DVD versions.

Sufficed to say, both versions will have been authored from the same master.

Here's an example: -

DVD =

Blu-ray =
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Last edited by SeeMoreDigital; 15th February 2011 at 17:48.
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