View Full Version : RED Format Resolutions
Rogelio Salinas
02-02-2007, 08:05 AM
I am just trying to find out the exact resolution to the RED formats. If any of you could fill in the blanks that would be cool:
4.5K = 4520 x 2540
4K = 4096 x ?
2K = 2048 x ?
1080P = 1920 x 1080
720P = 1280 x 720
480P = 720 x 480
Just 4K and 2K I am not completely sure of due to seeing different numbers being listed on different websights. Thanks.
Rob Lohman
02-02-2007, 10:37 AM
4.5K or 2540p = 4520 x 2540
4K = 4096 x 2304
2K = 2048 x 1152
1080 & 720 numbers are correct (as was 4.5K)
We do not support 480 (NTSC) or 576 (PAL). HD and up only.
There are various 4K & 2K resolutions in use. It depends on aspect ratios and a couple of other things. Since our sensor has a 16:9 shape the vertical resolution for 4K & 2K is 4096 and 2048 divided by 16:9.
In post you can crop that to other 4K & 2K "standards" or any aspect ratio you want / need.
Rogelio Salinas
02-02-2007, 11:16 AM
Thanks. I did not mean to put 480P, but just out of habit I did.
Brook Willard
02-02-2007, 01:55 PM
Rob, what is the full sensor resolution? I'm referring to the 4.9K overscan... 4900x2580? I know it can't be captured.
Rob Lohman
02-03-2007, 02:10 AM
Yes, 4900 x 2580. I wouldn't really use the term overscan for it though.
Brook Willard
02-03-2007, 11:47 AM
Look-around?
Rob Lohman
02-04-2007, 04:33 AM
Look-around uses the 4.5K area
Stuart English
02-04-2007, 09:50 AM
Rob is correct 4520 x 2540 is the max area, and its used for look around when you are shooting 4K, 2K, 1080p, 720p etc...
The pixels outside this maximum imaging area are matted off so that no light can illuminate them. Then we use their output to perform an automatic black level compensation - which you typically need to do manually on a professional level 3 chip CDD camera.
tj williams
02-04-2007, 04:26 PM
Wow Stuart that is very clever. So the red camera is automatically black balanced at 7.5ire at start up?
Cail Young
02-04-2007, 05:42 PM
Wow Stuart that is very clever. So the red camera is automatically black balanced at 7.5ire at start up?
One would hope 0IRE (or whatever the digital equivalent is), since RED doesn't speak SD...
Graeme Nattress
02-04-2007, 08:47 PM
TJ - digital video does not, and never has had any IRE or any 7.5IRE setup. HD, ofcourse, doesn't have "setup" either. Neither does Japan or any PAL for that matter, it's strictly an analogue North American NTSC oddity.
What Stuart is talking about is what the sensor thinks is black. It has no idea, so we tell it what is black by masking off a bunch of pixels around the outer edge of the sensor (don't worry, the sensor is made bigger to accomodate them, so you don't loose size or resolution) effectively stopping any light reaching them. They then become the black reference for the system.
In the world of HD SDI, black is recorded as code 16 on the 8bit scale, or code 64 on the 10bit scale. We adhere to these SMPTE standards on the HD SDI outputs.
So, no IRE, no analogue, not setup. Not even a badly named menu item that can screw your footage up if you set it wrongly :-)
Graeme