4k Anamorphic, then crop to 16x9, how many pixels left?

[David Kristensson]

hello redusers!

I have a question that was brought up last week and Im not smart enough to calculate this my self.:banghead:
when shooting 4K anamorphic on red mx, according to my pocket guide you are using 2816x2304 pixels?
then we want to crop a 16x9 frame out of that image. Ive heard that we have at least 2k res and another answer that tels me we have like 4k to work with.

does anyone know the exact image size?

cheers!!
/David

 

[Jeff Kilgroe]

With 2X anamorphic, you end up with a 5632x2304 raster, cropping to 16:9 from there gives you 4096x2304. If you were to crop while squeezed, you would be looking for 2048x2304.

If you're shooting 1.33X anamorphics (and I would have to question why you would), then a de-squeeze would leave you with 3744x2304, meaning you would have to crop off the bottom to get a de-squeezed 3744x2106 16:9 raster.

 

[David Kristensson]

Thank you Jeff!

 

[Jeff Kilgroe]

No problem. Just keep in mind that on these wide-aspect digital sensors, you really only want to shoot anamorphic for the look and optical characteristics, because you lose quite a bit of resolution.

 

[Deanan]

No problem. Just keep in mind that on these wide-aspect digital sensors, you really only want to shoot anamorphic for the look and optical characteristics, because you lose quite a bit of resolution.

For reference:
Epic 5k FF (5120x2700) = 13.8 Mpixels
Epic Anamorphic (3296x2700) = 8.9 Mpixels
4k HD (Quad HD @ 3840x2160) = 8.3 Mpixels
Alexa Anamorphic (2592x2160)= 5.9 Mpixel

 

[Seth Larney]

No problem. Just keep in mind that on these wide-aspect digital sensors, you really only want to shoot anamorphic for the look and optical characteristics, because you lose quite a bit of resolution.

Jeff is absolutely right, there is a substancial resolution loss when shooting Anamorphic on the RED - however if you do want those optical characteristics, keep in mind that the resolution loss of shooting ANA only starts to become a problem if you are finishing higher than 2K. For example, a standard DI 2K Ana frame is 2048x1556, so after debayering etc you still have a good amount of resolution to play with.

Although having said that, the more you oversample, the betting things look, generally - And it is always good to do your own tests and see what looks best for you, in your particular workflow.

But essentially - what Jeff said.