Red One resolution when turned sideways - better, worse?

[stephenv2]

Let's say you turn the Red sideways, 90 degrees, portrait if you will. I want to figure out if the sensor and/or debayering is optimizing in either horizontal or vertical directions.

In otherwords, is the Red One resolution direction agnostic or have, as in some cameras, techniques been used to optimize resolution in one direction or another. Thus, turning the camera sideways would affect those techniques.

I think it's possible the the sensor pattern and or debaying process might be but I would tend to think not. Can anyone confirm?

 

[Brandon Fraley]

what are you talking about? lol

I suppose for example if you're trying to key a head to toe shot of someone, you could turn the camera on it's side to get the maximum use of it's 16x9 sensor, but otherwise I can't imagine there's much merit to this... right?

 

[Charles Angus]

I don't think he's asking because he wants to do this, I think he's just trying to find out more about the technology. Specifically, whether it is optimized for horizontal or vertical use.

Am I right?

I'm going to continue as if I am.

I'm going to say, probably not. I really don't see how RedAlert! could tell whether you shot right side up, sideways, or had the camera right side up but took a shot of a sideways painting. I also don't see what it could do with that information. Maybe that's just a lack of imagination.

If you're asking whether it is secretly not full res vertically or horizontally, I would also tend to doubt that. I don't think that would make much sens, and there's no chroma subsampling, either.

 

[stephenv2]

what are you talking about? lol

I suppose for example if you're trying to key a head to toe shot of someone, you could turn the camera on it's side to get the maximum use of it's 16x9 sensor, but otherwise I can't imagine there's much merit to this... right?

I'm not talking about getting more pixels - I'm referring to pixel level. For example, in CCD cameras, some use pixel offset patterns to get more vertical resolution (but not horizontal), so turning the camera sideways (or even a dutch angle) will affect the image.

 

[stephenv2]

If you're asking whether it is secretly not full res vertically or horizontally, I would also tend to doubt that. I don't think that would make much sens, and there's no chroma subsampling, either.

I don't think it does either becausing it's a single CMOS debayer and typically you find this on 3 CCD setups. I just have a client who needs to know for sure for his specific application.

 

[Steve Freebairn]

http://www.red.com/cameras

Look at the link above and read the section that says
"PIXEL SHIFTING AND UP-REZZING NOT SPOKEN HERE"

The RED One looks great either landscape or portrait. It's just kind of funny to think about turning the RED sideways for more resolution (not a bad idea, there was a shot in the demo reel from RED where there was an effects shot that was done sideways).

 

[mikeburton]

I am looking at some footage right now that was shot portrait style for a product shot. There is no difference what so ever accept the shot being 90 degrees. Otherwise there is more vertical resolution when rotated but then you are cutting off horizontal resolution so it just depends how you are going to use it.

 

[Daniel Reichenbach]

I did it for a greenscreen/blackscreen shot, to have more resolution for a full persons shot, which I then used for different internet movie formats (from americain to wide), it worked perfect.

 

[Jochen Schmidt-Hambrock]

Now thats a good idea!

Jochen

 

[PeterM]

I think its not a nonsense question.
You have that issues sometimes with interlace cams. in that case the horizontal resolution is not equel to the vertical.
In the case of a bayer sensor in a DSLR or a red there is no difference.
Its very helpful to put the camerea in Potrait position eg for chroma key shooting talents , because you will get the full resolution.
It may become imparativ if you want to shoot with high fps and/ or medium quality glass which may let you should in cropped 2K mode.

 

[Simon Valderrama]

always use the "portrait" technique when i can in greenscreen shots.
amazing results, also when horizontal and vertical res are unequal like in DV cameras.
years ago i was able to get perfect greenscreen shots using mini-DV cameras, people could not believe that ...

 

[Stuart English]

Image Quality

Image Quality

The only "quality" aspect to this is maximizing the size of your subject in the frame.

So sometimes there may be benefit in rotating the camera 90 degrees.

But no, we don't do pixel offset or interlace or other encoding tricks more traditional CCD based video cameras may use.

 

[Graeme Nattress]

I use circular zone plates for measuring resolution. Horizontal and vertical resolution are identical. The algorithms don't favour horizontal over vertical or vertical over horizontal.

Due to the bayer pattern, diagonal resolution appears higher than horizontal or vertical resolution. This is to be expected due to the pattern. Because we use an optical low pass filter, this higher diagonal resolution manifests itself as less aliassing in the diagonals. In a 3 chip, foveon, or binned RGB stripe camera, diagonal resolution is lower than horizontal or vertical resolution. Think on it - the square pixel has a diagonal length of root 2 times the width, so the pixels are thus "further apart" on the diagonal. In these systems, if they use an OLPF at all, it is usually set for horizontal resolution, with corresponding increased aliassing on the diagonal.

Graeme

 

[Robert P. Hogue]

I can see that you may see some effects due to skewing in fast pans/motion if you do not have the proper shutter speed settings correct yada, yada, yada. This may produce a funny result, as I presume the sensor reads from left to right, before doing a read-reset, but I could be wrong.

 

[Joel Kaye]

I did it for a greenscreen/blackscreen shot, to have more resolution for a full persons shot, which I then used for different internet movie formats (from americain to wide), it worked perfect.

This is the reason to do it. And yes, that increases the number of pixels on a vertical subject like a full shot of a standing person. Works with any camera.

 

[John Brawley]

what are you talking about? lol
but otherwise I can't imagine there's much merit to this... right?

It's a common VFX technique to get maximum resolution when you have elongated subjects. I've done it before both film and video (not RED yet)

jb

 

[Jason Wingrove]

ive done it on green screen, for a full length shot of someone we knew we would want to blow up a bit later...dont understand the question but it worked fine

j

 

[Brandon Fraley]

It's a common VFX technique to get maximum resolution when you have elongated subjects. I've done it before both film and video (not RED yet)

jb

lol you reiterated the point that you edited out of my quote He said he wasn't talking about more pixels, but if there was something else going on. I said besides tilting on it side for to shoot a subject head to toe, there wasn't much merit, and so far that seems to be the consensus.