Originally Posted by stereomandan
I have the blue color filter from both the standard DVD editions of Avia and Digital Video Essentials. If I use the flashing color bars on the 709 disk to set my color level, will this be correct? I'm thinking it won't be due to a different color gamut with Blu-Ray
Basically DVE HD does the same thing in how it provides one filter for both SD and HD patterns. From what I've read it seems the accuracy of using a filter to set color and tint will vary depending on the display, so my opinion is that the question to be asking here is - how accurate might a color filter be in comparison to maybe using a spectroradiometer for my display? That's a question I can't really at all address for any displays other than what I own, but if you want to read through what follows I'll describe what's going on in regards to the media and how color gamut you mention relates.
SD (Ex: commercial DVD) and HD (Ex: Blu-ray) both store color information in terms of YCrCb. For SD, Rec. 601 defines an encode/decode relationship for YCrCb to RGB, and Rec. 709 relates YCrCb to RGB for HD. Although either video format stores color information as YCrCb, how to convert YCrCb to RGB differs between Rec. 601 and 709. This conversion difference matters because typically at some point YCrCb will be converted to RGB.
In a simple player and display setup, often either the display or player can be set to handle the conversion to RGB. One complication arises when upconverting or playing back both SD and HD, that being how to output YCrCb for another device to decode. Typically in such a setup, the expectation is that by outputting YCrCb at HD resolution (such as playing HD video or upconverting a DVD) Rec. 709 will be expected for decoding. One way to handle this is to use a conversion matrix on the YCrCb for the upconverted DVD so when it's decoded with Rec. 709 the resulting RGB values are similar to what would have been expected if Rec. 601 had been used with the original material.
Both of my players appear to simply use a standard conversion matrix for YCrCb in DVD upconversion as described (See Note 1). This assumption comes from how I measure similar color results at the display regardless if the player is outputting YCrCb from DVD, DVD upconverted to HD resolution, or native HD video (See ColorHCFR file attachment for measurements). While I do understand Rec. 709 does define intended color points that differ from what's defined by SMPTE-C, in terms of what information actually appears on the disk (YCrCb) and how that information is typically decoded (converted to RGB) Blu-ray really does not have any different color gamut from DVD. In practical terms a 75% blue is generally expected to be similar at the display, regardless if the source is DVD or HD media (See http://www.avsforum.com/avs-vb/showt...2#post11877342
for further discussion). This is why I'll generally suggest the video type is somewhat irrelevant, and what really matters is to ask - how accurate are filters in relation to the display I'm using?
Note 1 - It would be possible to modify YCrCb or RGB in different ways, but as far as I can tell this is not commonly done with standalone players so it's irrelevant for general discussion.
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