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Zidoo forum. Why the difference? Why is there such a difference between these two images? Care to explain the difference you see? If its tone mapping, I can measure them both.
Afair from memory - not double checked there is a slight variation in color mapping between those modes, that usually "shouldnt be there" - but nothing that qualifies as a huge oversight.
I'll only doublecheck if needed. If its aspects other than tonemapping you see in the images, the explaination might be different.
For most Bluray titles this is because of compression benefits. So source most likely iswhich then gets converted at some point. So if you are not measuring the output signal - it might also be how "the TV converts it" which is what I would measure also. SarcoJan 20, I just now read the "color banding" part. Its not clear from the images posted, as you see screen reflections in there as well. It would help to define the source's color bitrate is it a 10bit source?
Some form of color banding could be expected on any content, if its 8bit - and should to a lesser extend at 10bit. If the source is 10 bit, it could be the TVs signal handling. If its 8 bit the results are just strange would point at a signal handling issue, maybe on Zidoos part. Hard to tell. If it is 10bit - it still could be an issue on Zidoos part not pushing 10bit.
Again - hard to tell. Its this effect: I adjusted gamma to make it more visible. Edit: One more question - does it happen in the Zidoo player, as well as the Kodi player software? Last edited: Jan 20, Color banding could also come from bitrate compression, some h 10bit files may range from 2GB to 50 and more for same movie, the result may show banding.Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.
Digital signals are often compressed to reduce file size and save transmission time. Since the human visual system is much more sensitive to variations in brightness than color, a video system can be optimized by devoting more bandwidth to the luma component usually denoted Y'than to the color difference components Cb and Cr. In compressed images, for example, the Y'CbCr scheme requires two-thirds the bandwidth of non-subsampled "" R'G'B'. This reduction results in almost no visual difference as perceived by the viewer.
Because the human visual system is less sensitive to the position and motion of color than luminance,  bandwidth can be optimized by storing more luminance detail than color detail.
At normal viewing distances, there is no perceptible loss incurred by sampling the color detail at a lower rate, i. In video systems, this is achieved through the use of color difference components. The signal is divided into a luma Y' component and two color difference components chroma. A variety of filtering methods can be used to arrive at the resolution-reduced chroma values. Luma Y' is differentiated from luminance Y by the presence of gamma correction in its calculation, hence the prime symbol added here.
A gamma-corrected signal has the advantage of emulating the logarithmic sensitivity of human vision, with more levels dedicated to the darker levels than the lighter ones. As a result, it is ubiquitously used in the source tristimulus signal, the R'G'B' input.
The subsampling scheme is commonly expressed as a three-part ratio J : a : b e. The parts are in their respective order :. This notation is not valid for all combinations and has exceptions, e.
The mapping examples given are only theoretical and for illustration. Also note that the diagram does not indicate any chroma filtering, which should be applied to avoid aliasing.
To calculate required bandwidth factor relative to orone needs to sum all the factors and divide the result by 12 or 16, if alpha is present. Each of the three Y'CbCr components has the same sample rate, thus there is no chroma subsampling. This scheme is sometimes used in high-end film scanners and cinematic post-production.Deals Amazon deals Bargain threads Classified adverts. Log in Register. Search titles only. Search Advanced search…. What's new New posts Latest activity.
Now - what are the advantages of each and which is better?? Colours seem richer using RGB? But the default on the machine was YCbCr so there must be a benefit of that format also?
Whats's your preference, and have you compared the two side to side, or are you aware of the technical advantages of using one over the other? In theory, if this is right then RGB should kick ass - right??? Golden Balls. RGB PC levels can cause richer colours higher contrast but probably also lead to black crush,where you lose shadow detail.
Last edited: Jul 15, Trollslayer Distinguished Member. YCbCr - this more closely resembles how we differentiate colours. This is interesting already! Also what's Black Crush??? Avi Distinguished Member.
Golden Balls said:. Welwynnick Distinguished Member. These are fairly straightforward processes, and the optimum choise of format depends on where the process is performed best - source or display. These are all digital domain processes, so there should be much difference either way. Where there are differences, they are probably down to the respective video settings.The browser version you are using is not recommended for this site.
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Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.
Safari Chrome Edge Firefox. Include Files. Domain Dependencies. Headers: ippcore. Libraries: ippcore. Pointer to the ROI in the pixel-order source image. Array of pointers to the ROI in each plane of the planar source image. Distance in bytes between starts of consecutive lines in the source image.
Array of distance values for the source image planes. Pointer to the ROI in the pixel-order destination image. Array of pointers to the ROI in each plane of the planar destination image. Distance in bytes between starts of consecutive lines in the destination image. Array of distance values for the destination image planes. This function converts the Return Values. Indicates an error condition if any of the specified pointers is NULL. Indicates an error condition if roiSize.
YCbCr 444 vs YCbCr 422... Why the difference?
Submit feedback on this help topic. In This Topic. Product and Performance Information 1 Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors.
Notice revision So it doesn't possible in YCbCr. IO 0x05 inserts AV code into the output digital video stream. The sync has be able to regenerate the sync pulses similar to what our ADV can do. Do you mean ADV doesn't have that mode? Please refer Page96 of Register Control Manual. The STDI registers are valid when the is locked into the input stream, in that you can read the received format to determine how to set up the downstream sink to decode the embedded sync signals in the digital output.
I checked 0x7B on Register Control Manual. I 'll try to check this function when my PCBA sample is ready. Site Search User. Log in. Site Search Log in. Video requires membership for participation - click to join. Share More Cancel. Best regards Mehiro. Reply Cancel Cancel. Top Replies. ADV is just a receiver. Best regards, Mehiro. Thanks, Poornima. Hi, Poornima Thank you for the reply and I understood. I haven't tried YCbCr input. Regards, Poornima.We purchase our own TVs and put them under the same test bench, so that you can compare the results easily.
No cherry-picked units sent by brands. As displays have gotten more advanced, supporting ever higher resolutions and faster refresh rates, one of the biggest limiting factors in their development has been the available bandwidth of the cables that connect our devices. After all, what good is a display that has no way to transfer the signal from the player to the device?
One of the easiest ways to transfer more data is to compress the image, which allows for more information to be sent through the cable than it could normally support. Chroma subsampling is a type of compression that reduces the color information in a signal in favor of luminance data.
This reduces bandwidth without significantly affecting picture quality. A video signal is split into two different aspects: luminance information and color information. Luminance, or luma for short, defines most of the picture since contrast is what forms the shapes that you see on the screen. Color information, chrominance, or simply chroma is important as well, but has less visual impact.
What chroma subsampling does is reduce the amount of color information in the signal to allow more luminance data instead. Because of bandwidth limitations from internet speeds and HDMI, this makes for much more efficient use of current systems.
The first number in this case 4refers to the size of the sample. The two following numbers both refer to chroma. They are both relative to the first number and define the horizontal and vertical sampling respectively. A signal with chroma has no compression so it is not subsampled and transports both luminance and color data entirely.
In a four by two array of pixels, has half the chroma ofand has a quarter of the color information available. Artifacts from chroma subsampling are at their most noticeable with text atop a flat color. The impact is far less visible in videos and photos. This matters when connecting your TV to a computer, as you don't want your text to be blurry to the point of being unreadable. As you can see, the lack of detail is clearly apparent in the bottom two rows. The text is all muddled together, and a lot of it is completely unreadable.
While fares better thanit still isn't what most would consider acceptable. While this pattern showcases an extreme case, similar side effects are visible in normal usage as well. It usually makes standard text look fuzzy and reduces its clarity. Now, its importance with smaller text is undeniable, but what about with movies? The benefits of having full color in video are debatable, especially at 4k.
It would be tough to recognize the difference between a full sequence and the same content in There is virtually no advantage to using for consuming video content. If anything, it would raise the costs of distribution by far more than its comparative visual impact.
ADV7613 LVDS data mapping for YCbCr422
This becomes especially true as we move towards 4k and beyond. The higher the resolution and pixel density of future displays, the less apparent subsampling artifacts become. While some PC games that have a strong focus on text might suffer from using chroma subsampling, most of them are either designed with it in mind or implement it within the game engine.Deals Amazon deals Bargain threads Classified adverts.
I don't care about letter clarity for reading etc, I care about how games look. Please don't speculate, answer if you really know what you are talking about. Thanks in advance. Eddy Distinguished Member. There's an excellent article on Rtings that explains the effect of a chroma subsampling. But basically will be fine for games as long as they don't rely on a lot of small text which could make it less clear. Thank you for taking the time but you are not really answering my question. Also hdmi 2.
NoiSy MaN said:. Eddy said:. Ok but you said you were using 10 bit colour, hence my reply. Can you clarify what your question is? Last edited: Sep 13, Ah right, I didn't get that from your OP. Theydon Bois Member.
Ah right, yes you can't do that with bit. Isn't my opening post and title clear enough? And if you'd prefer to use for 8-bit then that will be fine. It may not make much difference to most SDR games, but at least you'll know if should be displaying at it's best. Theydon Bois said:. Just a freindly tip, the person answering your question is helping you. Dial it down a little.
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