Topics

Alexa mini anamorphic scaling settings

Bruce Alan Greene
 

This was originally a kind of Resolve/post question, but I'm really interested in the best camera settings.  The question below refers to RroRes settings in the camera, but perhaps recording RAW might solve this issue in post?

I'm not sure of the post production / color corrections issues of working from full frame RAW and the amount of computing power necessary to work with this.  I suspect that I will be doing color post on this myself eventually, or perhaps with an independent colorist who might not have the most powerful computer and RAID set up.  So that is a consideration in this workflow.  I don't really care about RAW for the color aspect of it, I'm just concerned with computer overhead.  For me, ProRes is fine for color as I don't mind setting the color temp in the camera and recording Log.

We're about to begin a feature film shooting with Alexa mini and Cooke 2x anamorphic lenses.

My question is about the best way to shoot and set the camera.

The camera records 2880x2160 pixels in ProRes. But, to get to 2.39:1 aspect ratio, we will need to crop to 2578 pixels wide. So, essentially, the master image will be 2160x2578.

I have a choice: I can set the camera to 2k and it will scale the image to 2048x858 pixels in camera. 
If I don't scale to 2k, I will record the situation above, which, will eventually need to be scaled to 2k for DCP.

I've been looking in the Resolve settings, and I can't see any way that resolve will deal with the 2880x2160 image and crop it correctly to 2160x2578. The only way I can see is to set each and every clip to stretch the horizontal by 2x and let the sizing be set to no resize, center crop. But this means selecting each and every clip and changing the width by 2x. 

Is there any standard way to deal with this set up? In other words, to get the correct aspect ratio and cropping and work in a timeline of 5156x2160 (no resize except width stretch to de-anamorphasize. (is that a word?) It would seem non-optimal to scale to 4k and then re-scale to 2k which would add an additional scaling operation.

Or, is it best to just have the camera do the scaling to 2048x858 and be done with it?

Thanks guys. Will be shooting a teaser on Friday so I must decide for the teaser soon!
 
Bruce Alan Greene
DP Los Angeles 

Argyris_Theos_cml
 

a)       Test test test

b)      Input Scaling in Resolve does it and can be batch applied to all clips in seconds

c)       Prefer the assistance of a competent colorist, they know a thing or two

d)      Test test test

 

Argyris Theos, gsc

DoP

Athens Greece

+306944725315

skype Argyris.Theos

www.vimeo.com/argyristheos

 

From: cml-raw-log-hdr@... [mailto:cml-raw-log-hdr@...] On Behalf Of Bruce Alan Greene
Sent: Monday, May 28, 2018 11:17 PM
To: cml-raw-log-hdr@...
Subject: [cml-raw-log-hdr] Alexa mini anamorphic scaling settings

 

This was originally a kind of Resolve/post question, but I'm really interested in the best camera settings.  The question below refers to RroRes settings in the camera, but perhaps recording RAW might solve this issue in post?

I'm not sure of the post production / color corrections issues of working from full frame RAW and the amount of computing power necessary to work with this.  I suspect that I will be doing color post on this myself eventually, or perhaps with an independent colorist who might not have the most powerful computer and RAID set up.  So that is a consideration in this workflow.  I don't really care about RAW for the color aspect of it, I'm just concerned with computer overhead.  For me, ProRes is fine for color as I don't mind setting the color temp in the camera and recording Log.

We're about to begin a feature film shooting with Alexa mini and Cooke 2x anamorphic lenses.

My question is about the best way to shoot and set the camera.

The camera records 2880x2160 pixels in ProRes. But, to get to 2.39:1 aspect ratio, we will need to crop to 2578 pixels wide. So, essentially, the master image will be 2160x2578.

I have a choice: I can set the camera to 2k and it will scale the image to 2048x858 pixels in camera. 
If I don't scale to 2k, I will record the situation above, which, will eventually need to be scaled to 2k for DCP.

I've been looking in the Resolve settings, and I can't see any way that resolve will deal with the 2880x2160 image and crop it correctly to 2160x2578. The only way I can see is to set each and every clip to stretch the horizontal by 2x and let the sizing be set to no resize, center crop. But this means selecting each and every clip and changing the width by 2x. 

Is there any standard way to deal with this set up? In other words, to get the correct aspect ratio and cropping and work in a timeline of 5156x2160 (no resize except width stretch to de-anamorphasize. (is that a word?) It would seem non-optimal to scale to 4k and then re-scale to 2k which would add an additional scaling operation.

Or, is it best to just have the camera do the scaling to 2048x858 and be done with it?

Thanks guys. Will be shooting a teaser on Friday so I must decide for the teaser soon!

 

Bruce Alan Greene
DP Los Angeles 

Bruce Alan Greene
 

Testing is not so easy as I’m on location with only a laptop and no proper 4K display to view scaling on. Hence my request from others with experience shooting anamorphic with the Alexa.

Bruce Alan Greene
DP Los Angeles / Kiev (for now)


On May 29, 2018, at 07:00, Argyris_Theos_cml <cml@...> wrote:

a)       Test test test

b)      Input Scaling in Resolve does it and can be batch applied to all clips in seconds

c)       Prefer the assistance of a competent colorist, they know a thing or two

d)      Test test test

 

Argyris Theos, gsc

DoP

Athens Greece

+306944725315

skype Argyris.Theos

www.vimeo.com/argyristheos

 

From: cml-raw-log-hdr@... [mailto:cml-raw-log-hdr@...] On Behalf Of Bruce Alan Greene
Sent: Monday, May 28, 2018 11:17 PM
To: cml-raw-log-hdr@...
Subject: [cml-raw-log-hdr] Alexa mini anamorphic scaling settings

 

This was originally a kind of Resolve/post question, but I'm really interested in the best camera settings.  The question below refers to RroRes settings in the camera, but perhaps recording RAW might solve this issue in post?

I'm not sure of the post production / color corrections issues of working from full frame RAW and the amount of computing power necessary to work with this.  I suspect that I will be doing color post on this myself eventually, or perhaps with an independent colorist who might not have the most powerful computer and RAID set up.  So that is a consideration in this workflow.  I don't really care about RAW for the color aspect of it, I'm just concerned with computer overhead.  For me, ProRes is fine for color as I don't mind setting the color temp in the camera and recording Log.

We're about to begin a feature film shooting with Alexa mini and Cooke 2x anamorphic lenses.

My question is about the best way to shoot and set the camera.

The camera records 2880x2160 pixels in ProRes. But, to get to 2.39:1 aspect ratio, we will need to crop to 2578 pixels wide. So, essentially, the master image will be 2160x2578.

I have a choice: I can set the camera to 2k and it will scale the image to 2048x858 pixels in camera. 
If I don't scale to 2k, I will record the situation above, which, will eventually need to be scaled to 2k for DCP.

I've been looking in the Resolve settings, and I can't see any way that resolve will deal with the 2880x2160 image and crop it correctly to 2160x2578. The only way I can see is to set each and every clip to stretch the horizontal by 2x and let the sizing be set to no resize, center crop. But this means selecting each and every clip and changing the width by 2x. 

Is there any standard way to deal with this set up? In other words, to get the correct aspect ratio and cropping and work in a timeline of 5156x2160 (no resize except width stretch to de-anamorphasize. (is that a word?) It would seem non-optimal to scale to 4k and then re-scale to 2k which would add an additional scaling operation.

Or, is it best to just have the camera do the scaling to 2048x858 and be done with it?

Thanks guys. Will be shooting a teaser on Friday so I must decide for the teaser soon!

 

Bruce Alan Greene
DP Los Angeles 

Argyris_Theos_cml
 

An idea might be to burn a minute or less to dcp via any of the free programs. Then screen it at a local theater. 

My 2 Eurocents 

Argyris Theos, gsc 
DoP, Athens Greece,
+306944725315
Skype Argyris.Theos
via iPhone

29 Μαΐ 2018, 7:58 πμ, ο/η Bruce Alan Greene <bruce@...> έγραψε:

Testing is not so easy as I’m on location with only a laptop and no proper 4K display to view scaling on. Hence my request from others with experience shooting anamorphic with the Alexa.

Bruce Alan Greene
DP Los Angeles / Kiev (for now)


On May 29, 2018, at 07:00, Argyris_Theos_cml <cml@...> wrote:

a)       Test test test

b)      Input Scaling in Resolve does it and can be batch applied to all clips in seconds

c)       Prefer the assistance of a competent colorist, they know a thing or two

d)      Test test test

 

Argyris Theos, gsc

DoP

Athens Greece

+306944725315

skype Argyris.Theos

www.vimeo.com/argyristheos

 

From: cml-raw-log-hdr@... [mailto:cml-raw-log-hdr@...] On Behalf Of Bruce Alan Greene
Sent: Monday, May 28, 2018 11:17 PM
To: cml-raw-log-hdr@...
Subject: [cml-raw-log-hdr] Alexa mini anamorphic scaling settings

 

This was originally a kind of Resolve/post question, but I'm really interested in the best camera settings.  The question below refers to RroRes settings in the camera, but perhaps recording RAW might solve this issue in post?

I'm not sure of the post production / color corrections issues of working from full frame RAW and the amount of computing power necessary to work with this.  I suspect that I will be doing color post on this myself eventually, or perhaps with an independent colorist who might not have the most powerful computer and RAID set up.  So that is a consideration in this workflow.  I don't really care about RAW for the color aspect of it, I'm just concerned with computer overhead.  For me, ProRes is fine for color as I don't mind setting the color temp in the camera and recording Log.

We're about to begin a feature film shooting with Alexa mini and Cooke 2x anamorphic lenses.

My question is about the best way to shoot and set the camera.

The camera records 2880x2160 pixels in ProRes. But, to get to 2.39:1 aspect ratio, we will need to crop to 2578 pixels wide. So, essentially, the master image will be 2160x2578.

I have a choice: I can set the camera to 2k and it will scale the image to 2048x858 pixels in camera. 
If I don't scale to 2k, I will record the situation above, which, will eventually need to be scaled to 2k for DCP.

I've been looking in the Resolve settings, and I can't see any way that resolve will deal with the 2880x2160 image and crop it correctly to 2160x2578. The only way I can see is to set each and every clip to stretch the horizontal by 2x and let the sizing be set to no resize, center crop. But this means selecting each and every clip and changing the width by 2x. 

Is there any standard way to deal with this set up? In other words, to get the correct aspect ratio and cropping and work in a timeline of 5156x2160 (no resize except width stretch to de-anamorphasize. (is that a word?) It would seem non-optimal to scale to 4k and then re-scale to 2k which would add an additional scaling operation.

Or, is it best to just have the camera do the scaling to 2048x858 and be done with it?

Thanks guys. Will be shooting a teaser on Friday so I must decide for the teaser soon!

 

Bruce Alan Greene
DP Los Angeles 

Argyris_Theos_cml
 

Oh, since you are in Kiev
I recall they had good lab about 5 or 6 years ago. You may screen there perhaps


Argyris Theos, gsc
DoP, Athens Greece,
theos@...
+306944725315
Skype Argyris.Theos
www.vimeo.com/argyristheos
via iPhone

29 Μαΐ 2018, 7:58 πμ, ο/η Bruce Alan Greene <bruce@...> έγραψε:

iev (for now)

hraedlein@...
 

I would go for the ProRes 2.39 2K Ana setting, as you will then have 120 fps and no hassle in post.

Downside is that you do not have space for repositioning horizontally which you would have in pure 4:3 mode. And you stick to a 2K DCP, but with very nice image quality due to downscaling from higher pixel count.

Of course you need the 4:3 license.

Kind regards

Henning Rädlein

 

 

http://www.arri.com/camera/alexa_mini/camera_details/alexa-mini/subsection/license_options/

ALEXA Mini 4:3 License Key
This license, enabled by ALEXA Mini SUP 4.0, provides three new ProRes recording modes that access the full 4:3 sensor area and support the use of anamorphic lenses. The first mode records the highest 4:3 resolution possible, while the other two de-squeeze and re-scale the recorded images in-camera for an efficient, specialized workflow. Monitoring paths for all 4:3 modes offer SDI setups featuring dual 1.5G or 3G outputs.

  • ProRes 4:3 2.8K records the full 4:3 sensor area (2880 x 2160) and can be used with anamorphic or spherical lenses. It offers frame rates up to 50 fps and an optional 2x anamorphic de-squeeze for the EVF and SDI monitoring paths.
  • ProRes 2.39:1 2K Ana. records a 2.39:1 standard 2K format (2048 x 858), which does not require any cropping or scaling in post. Due to the in-camera scaling the data rate is reduced, allowing recording speeds up to 120 fps.

Bruce Alan Greene
 

Thanks Henning.  We shot a teaser today with the 2k setting, letting the camera do the scaling to 2k.  We'll see it in theaters in a few days and see how it looks in "the wild" :)

Bruce Alan Greene
DP Los Angeles