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Old 05-13-2008, 04:20 PM   #1
tex098
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Default What does the 5k, 4k, 3k...etc. mean?????

Can someone explain what these actually mean. Is it an "amount" of data processed and stored by the camera??? How does it relate or compare to SD, HDV, etc. I know it is much better but I am just trying to understand what it means exactly. Is it the name of the format???

Last edited by tex098; 05-13-2008 at 04:29 PM.
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Old 05-13-2008, 04:36 PM   #2
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it relates to the number of pixels that are captured in a frame.
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Old 05-13-2008, 04:53 PM   #3
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Quote:
Originally Posted by tex098 View Post
Can someone explain what these actually mean. Is it an "amount" of data processed and stored by the camera??? How does it relate or compare to SD, HDV, etc. I know it is much better but I am just trying to understand what it means exactly. Is it the name of the format???
Specifically, it refers to the horizontal dimension of the area captured. An HD frame is measured as 1920 pixels horizontal by 1080 pixels vertical. A 2K frame at 16:9 proportion is 2048 pixels by 1152 pixels. 3K at 16:9 is 3072 x 1728, 4K at 16:9 is 4096 x 2304. Multiplying these horizontal by vertical dimensions will provide you with the megapixel values of the area coverage. So an HD signal is 2.07MP and a 4K signal is derived from a 9.44MP area, almost 5 times the information.

There are many other significant variables to consider in comparing the Scarlet technology to the video technologies that you might be familiar with, such as Bayer pattern CMOS sensors and RAW data capture. To pick up a lot of valuable background on RED's unique technology, you might check out the FAQ section on the red.com website : http://www.red.com/faq/

Check it out!
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Old 05-13-2008, 05:21 PM   #4
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And, to throw a total monkey wrench into the understanding: video formats are referred to by their VERTICAL (y-axis) resolution, whereas the 2K/3K/4K digital cinema formats are referred to by their HORIZONTAL resolution.

So, in video, you'll hear about 480i, 480p, 720p, 1080p, and 1080i. Those correspond, of course, to:
480i/480p: 720 x 480
720p: 1280x720
1080p/i: 1920 x 1080

But, in the digital cinema notations of 2K/3K/4K, it's talking about the horizontal (x-axis) res. So:

2K = 2048 wide (2 x 1024, 1024 = 1K) so it's 2048 x 1152.
3K = 3072 wide (3 x 1024) for 3072 x 1728
4K = 4096 wide (4 x 1024) for 4096 x 2304.

Using these numbers, we can see that 2K is only slightly bigger than 1080P, even though "2K" (2048) sounds like a lot more than 1080, right? It's because the 2K refers to the horizontal, whereas the 1080P refers to the vertical. But once you do the math, you find it's 2048x1152, vs. 1920x1080. So 2K is about 14% larger than 1080P.

On the other hand, people sometimes think that 4K is twice the res of 2K, when in fact it's 4x as much. 4K is twice as many horizontal pixels, and it's also twice as many vertical, so you could fit four full 2K frames inside one 4K frame.

Last edited by Barry Green; 05-13-2008 at 05:24 PM.
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Old 05-13-2008, 05:54 PM   #5
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Thanks for the replies. I am with you so far. I will read the FAQ section of the RED website.

I read on this forum that the Scarlet will capture 3k but only deliver 2k. Why is this the case??
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Old 05-13-2008, 07:52 PM   #6
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Hey, and welcome to the community; you will learn A LOT on these forums, trust me.

The reason everyone and their grandmother sees Scarlet as a 2k delivery camera even though the specs clearly indicate a 3k sensor is because of a few things; sensor type, advantage of down sampling, and delivery formats.

Sensor: while the sensor will be 3k, since it will be using a bayer filter to arrange the data, you really get about 70-80% of the actual resolution, but its is a very efficient method, which creates a very organic and smooth image in return. Now this isn't to say that the footage won't look great at 3k, because it will;our eyes perceive moving images as "sharper" compared to still images of the same resolution. Plus, with a little added artificial sharpening in post if desired, you can make up that lost 20% or so percent of resolution and still come out with phenomenal 3k footage from Scarlet.

downsampling: With the above in mind, instead of going for 3k, you could just take your 3k footage, and down sample to about 2k, where the camera resolves 100% detail. This means that the footage shot at 3k will look amazingly detailed and "sharp" when downscaled to 2k mainly because it is basically the sweet spot for bayer filtered 3k. Most will opt for a 2k down sample for this reason.

delivery: in the digital cinema world, 3k really isn't a master format; it is an official spec in the post world I believe, but as a master format, the norm is 2k and 4k. With Scarlet, with the above in mind, clearly 2k would be the best mastering option. Also, with HDTV, 1080p is close enough to 2k as a good mastering format for television produced media.

Hope this helps; keep in mind everything I said here I learned on Reduser.net. Any of the big boys out there feel free to correct where I went wrong.
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Old 05-15-2008, 08:01 AM   #7
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To do the math:

2k is ~14% better than 1080p.

Though this is speculation, if we are going with the same percentages as the Red One for resolved resolution, ~2.4k will be the actual resolved resolution.

Though people say "Well, that is pretty much 2k", if you do the math, you get a LOT more resolution than 2k.

2.4k is ~37% higher resolution than 2k, and 56% higher resolution than 1080p!!!!!

That is a LOT more room to play with in post! Though many will still deliver in 2k (as they should), do not underestimate the enormous (speculative) fully resolved space you have to play with in post!

I am excited!
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