Extended Functions

[ARRI LogC3] Has Been Added as a Photo Style

This section explains the extended functions that become available by using an Upgrade Software Key (DMW-SFU3A: optional).

[ARRI LogC3] Has Been Added as a Photo Style

It is now possible to select [ARRI LogC3] from [Photo Style].

This can only be selected in [ icon_mode-p-motion_table ] mode with [Rec. File Format] set to [MOV] or [Apple ProRes].

button_menu-set [ icon_movie ] [ icon_photo-quality ] Select [Photo Style]

icon_photo-style-arri-log3 [ARRI LogC3]

A setting for log video that conforms to the EI800 gamma curve from the LogC3 specification offered by ARRI ( character_reference Log Recording)

It allows the production of images rich in gradation through post-production techniques.

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It is possible to set [ARRI LogC3] in the Photo Style display restrictions in the Photo Style setting of the [Custom] ([Image Quality]) menu.

In [LUT Select(ARRI LogC3)] in [Log View Assist] in the [Custom] ([Monitor / Display (Video)]) menu, select the LUT data to apply from either [ARRI 709] or registered LUT data. Also, in [LUT View Assist (Monitor)] and [LUT View Assist (HDMI)], it is possible to output images with the LUT data set in [LUT Select(ARRI LogC3)] applied.

Functions are restricted as follows when [ARRI LogC3] is set:

– Cannot record with the [MP4] recording quality.

– ISO sensitivity is restricted to a lower limit of 160 (lower limit of 1250 when [Dynamic Range Boost] is set).

– The luminance level setting is fixed to [64-940].

– [Master Pedestal Level] is not available.

– The only image quality adjustments available are [Sharpness] and [Noise Reduction].

– The 0 dB in the seconds/dB in [SS/Gain Operation] is equivalent to ISO1250 (when [Dynamic Range Boost] is set to [ON])/ISO160 (when [Dynamic Range Boost] is set to [OFF]).

Log Recording

icon_mode-photo_gray icon_mode-movie

icon_mode-ia_gray icon_mode-p_gray icon_mode-a_gray icon_mode-s_gray icon_mode-m_gray icon_mode-creative-motion

Log recording is possible when [Photo Style] is set to [ARRI LogC3]. It allows the production of images rich in gradation through post-production techniques.

Set [Rec. File Format] to [MOV] or [Apple ProRes].

button_menu-set [ icon_movie ] [ icon_photo-quality ] [Photo Style] Select [ARRI LogC3]

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Post-production processing is enabled by utilizing LUT (Look-Up Table).

Download the LUT data for [ARRI LogC3] from the following:

(1) ARRI Look Library (LogC3-to-Rec709)

A LUT data with the ARRI Look File applied for the Rec.709 color space.

There are 87 types of Look Files, providing you with a great variety.

https://www.arri.com/resource/blob/365070/de67ce8908d30b22d83526dc4c1c8732/arri-look-library-logc3-to-rec709-3d-luts-data.zip

(2) ARRI Look Library (log-to-log)

A LUT data for applying Looks with the Log space as is with its rich color information.

Similarly to (1), there are 87 types of Look Files, providing you with a great variety.

https://www.arri.com/resource/blob/283984/763aadc4a2be5c301529704b1357513c/arri-look-library-logc3-log-to-log-3d-luts-data.zip

(3) ARRI LogC3 LUT Package

A LUT data for converting from ARRI LogC3 to the color spaces of a variety of display devices.

By going through (2) ARRI Look Library (log-to-log), it is possible to produce the Look according to the color space you are aiming for.

https://www.arri.com/resource/blob/294620/f4290b963ff83a4dde4fff795645bc26/2022-09-arri-logc3-v1-2-lut-package-data.zip

Refer to the following site for information regarding ARRI Look Files:

https://www.arri.com/en/learn-help/learn-help-camera-system/image-science/look-files

character_diamond ISO Sensitivity When [ARRI LogC3] Is Set

ISO sensitivity can be set in the range between 1250 and 12800 (When [Dynamic Range Boost] is set to [ON]) or between 160 and 12800 (When [Dynamic Range Boost] is set to [OFF]).

character_diamond Exposure When [ARRI LogC3] Is Set

The log characteristics of [ARRI LogC3] comply with 800 ASA (EI 800), described in “ARRI_ALEXA_LogC_Curve_in_VFX.pdf” released by ARRI. The log characteristics of [ARRI LogC3] on this camera do not depend on the ISO sensitivity settings. However, there will be clipping worth the equivalent of 2 stops when [Dynamic Range Boost] is set to [ON] or the equivalent of 3 stops when [Dynamic Range Boost] is set to [OFF], according to the Exposure Stops values defined in 800 ASA (EI 800).

Refer to the following for “ARRI_ALEXA_LogC_Curve_in_VFX.pdf”:

https://www.arri.com/resource/blob/31918/66f56e6abb6e5b6553929edf9aa7483e/2017-03-alexa-logc-curve-in-vfx-data.pdf

Diagram of the log characteristics of [ARRI LogC3] on this camera

image_arri_logc3-character

(1) 18 % gray

(2) Clipping level (When [Dynamic Range Boost] is set to [OFF])

(3) Clipping level (When [Dynamic Range Boost] is set to [ON])

	When [Photo Style] is set to [ARRI LogC3]
	Exposure Stops (18 % gray standard)	Full range			Video range
		IRE (%)	Code Value		IRE (%)	Code Value
		IRE (%)	10 bit	12 bit	IRE (%)	10 bit	12 bit
Black level	—	3.5	95	380	9.2	145	580
(1)	0.0	38	400	1600	39	407	1628
(2)	4.6	78	748	2992	73	705	2820
(3)	5.6	87	824	3296	81	770	3080

When the [Photo Style] is set to [ARRI LogC3], the [Luminance Level] is fixed to [64-940] (video range).

The recorded data is recorded as video range.

HDMI output is output as video range.

The waveform and vector scope are both displayed as video range.

The luminance spot meter displays the 18 % gray output level as 0 Stop.