Aja KONA LHi User Manual download pdf (Page 81)

KONA v10.5 www.aja.com

Notes on using

multiple AJA

Products:

Performance of multi-product use depends on a variety of factors: CPU usage, RAM, disk

IOPS/ bandwidth for streams of video, etc. and therefore performance may vary. Also be

aware that multiple input/output streams are only supported by software that is

explicitly designed for a multi-product environment.

Using 8-bit Versus 10-bit Video

While both 8- and 10-bit uncompressed video are capable of providing excellent quality

broadcast video, 10-bit represents a significantly higher quality and is preferable in many

situations.

Because 10-bit video has four times the numerical precision when compared to 8-bit, it

has a signal-to-noise ratio 12 db higher than 8-bit video.

Visually, in 8-bit video compared to 10-bit video, you will notice a substantial difference.

In 8-bit video there will be “contour lines” or “striations” visible, particularly noticeable in

scenes having soft gradients like a ramp or sunset. For example, if a sky region is mostly

the same color but varies by only a few digital numbers from one side of the picture to

another, you may see contour lines where the signal passes from one digital value to the

next higher value.

Since each numerical value in a 10-bit system is only one fourth as large as an 8-bit

system's, these contours become invisible and the sky varies smoothly.

10-bit video is often used when the source and output video (or “master”) is also 10-bit.

Even if the input and/or output video is 8-bit, a 10-bit “project” will still maintain a higher

quality when there is a significant amount of effects rendering involved.

Industry standard professional mastering formats—Sony Digital Betacam for Standard

Definition and Panasonic D5 for High Definition—are both true 10-bit formats.

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Aja KONA LHi User Manual Page 81