Image encoding for ARRI Wide Gamut color space.
FAQ
The Log C curve is a logarithmic encoding of the scene, meaning that the relation between exposure measured in stops and the signal is constant over a wide range. Each stop of exposure...
The Log C curve is a logarithmic encoding for images that is used in all of ARRI's digital cameras. The encoding has a transfer characteristic similar to that of a scan from negative film.
The Hybrid Log Gamma curve is an HDR standard defined by NHK and BBC. It is specified in ITU Rec BT 2100. The HLG specification offers a degree of compatibility with legacy displays by more...
No. Going from ARRIRAW to Log C encoded files means no information loss. ProRes is capable to hold all the information that is inside an ARRIRAW frame in ARRI Wide Gamut 4 (LogC4) or ALEXA...
Images with Log C encoding in the ALEXA/AMIRA-specific wide gamut color space provide the camera's full latitude in an unconfined color space. For ALEXA and AMIRA cameras this is...
Look files for ALEXA 265/35 (*.alf4 files, log-to-log).
Collection of log-to-log 3D-LUTs for postproduction. Use for footage shot with ALEXA 265/35.
To use the Look Library in post production, download the Log-to-Log version for LogC4 here (ALEXA 35, ALEXA 265 or later). Please keep in mind that those need to be need to be...
Collection of log-to-log 3D-LUTs for postproduction. Use for footage shot with ALEXA Classic, ALEXA Mini, AMIRA, ALEXA 65, ALEXA LF, or ALEXA Mini LF.
16 bit linear encoding is neither efficient nor necessary for recording images. Images can be converted from 16 bit linear to 12/13 bit log without any loss of information or quality...
The looks can be adjusted using CDL parameters after duplicating them in the camera. This way it is possible to use ARRI Look Library looks as a basis to create new adjusted versions which are...
This is not an error! You have chosen to record in “ Log C ” – ARRI’s native color encoding. Opposed to a “video” image (in REC 709 color space) Log C maintains more details in the...
LogC3 Specification (not valid for ALEXA 35) - ARRI LogC3 "ALEXA Log C curve in VFX".
All 3D-LUTs you want to use in ALEXA 35 or ALEXA 265 need to be converted to an ARRI Look File 4. You use our ARRI Reference Tool to do so. You can choose to either use ARRI Color Management...
The Look Library "for post production" is available as Log-to-Log 3D-LUTs (*.cube) for LogC3 and LogC4 on our Look Files Website . Some 3rd party applications are able to...
Look files for ALEXA Mini, AMIRA, ALEXA SXT, ALEXA 65, ALEXA LF, and ALEXA Mini LF (*.aml files, log-to-Rec 709).
The ARRI Look Library is part of the camera software of ALEXA and AMIRA cameras: it is available in ALEXA 35, ALEXA Mini, and AMIRA. Look Library Looks (ALF-2 format) are compatible with ALEXA SXT,...
Beginning with ALEXA Classic cameras SUP 3.0 until SUP 7.0 ARRI offered a film style matrix that could be applied to the Log C output. The same transform was also available as a 3D-LUT for...
When viewed directly, Log C footage looks flat with desaturated colors, LogC4 might seem underexposed. To get an image with a grayscale characteristic and color reproduction that is visually...
Dive into ARRI's Color FAQ for insightful information on ARRI Color Science, ARRI's log encoding, Rec 709 and Rec 2020. Discover more now!
Currently, there are three distribution standards for HDR video to the home: HDR10 Dolby Vision Hybrid Log Gamma And one standard for distribution to the cinema: Dolby Vision Cinema
As explained in the answer "What is Log C?" the maximum value of the Log C function depends on the exposure index. In a video image, however, one wants to have the clipping...
You do not need any special software. Any system that can work with Log C data and 3D LUTs can be used to generate an HDR master. You may need special software, however, to create specific...
"Wide gamut" is a generic term for color gamuts that are larger than Rec. 709, i.e. P3 or Rec. 2020. ARRI Wide Gamut 3/4 is the name of the color encoding space used in combination...
At this point in time the WiFi of the ALEXA LF and ALEXA SXT W offers only access point mode, which means that external devices can connect to the ALEXA WiFi network, but the ALEXA cameras with...
Use an HDR monitor on set to judge your images in HDR. ARRI provides look files and 3D-LUTs that convert the Log C image into HDR using the SMPTE ST-2084 („PQ“) encoding. These look files...
If your camera is not calibrated, there is a link in the ARRI AMIRA license shop to log a service request with an ARRI service center, for those whose camera was purchased direct from ARRI.
Yes. ARRI provides a downloadable zip file containing a sample ARRIRAW file and derivative images , including a Log C DPX frame, an ACES OpenEXR frame and display-ready frames. These can be...
Yes, some color grading tools offer such features. The quality most likely will not be as good as working from Log C original files (or film scans). But since there is a lot of existing SDR...
ARRI Look File 1 offers CDL-like controls as well as printer lights, saturation and a user-definable tone mapping curve. The ALF-1 does not apply LIFT/Gamma/Gain before but after the...
Generally speaking, you need to export the look as a 3D-LUT and combine this into an ARRI Look File. For ALEXA 35 or ALEXA 265 this needs to be a Log-to-Log 3D-LUT based on actual...
ARRIRAW is the raw format of ARRI's digital cameras. Its file extension is *.ari or *.mxf. The sensor readout of our ALEV3 and ALEV4 sensor is a raw Bayer frame provided as uncompressed, 12...
ALF2 look files are designed to work with ALEXA Mini, ALEXA SXT, ALEXA 65, ALEXA LF, ALEXA Mini LF, as well as AMIRA (all using our ALEV3 sensor). They combine a creative grade (CDL or custom LUT)...
The ALEV4 sensor offers 17 stops and the ALEV3 sensor 14+ stops of dynamic range with a base sensitivity of EI 800. This dynamic range is available in both ARRIRAW and Log C encoded ProRes...
While HDR displays are just now becoming available, ARRI digital cameras have always captured a high dynamic range far exceeding the capabilities of displays. So ARRI digital cameras have been...
All up-to-date VFX tools have native support for ARRIRAW processing. For applications without ARRIRAW support, the footage can be processed to e.g. 10 bit log *.dpx or 16 bit floating-point...
The ALEXA Mini LF allows recording in ARRIRAW and Apple ProRes Log C. It is not possible to record a baked-in look, as that would use too much processing power. However, the whole ARRI Look...
There is one general HDR standard (Rec 2100) and a number of different distribution standards, of which three are the most popular (for a detailed description of all standards see our "HDR...
Two general requirements must be met to experience HDR at home: a) your TV set must be HDR compatible. The first displays compatible with one of the three main HDR distribution standards (HDR10...
A HDR workflow is not much different from current workflows. The ALEXA Wide Gamut/Log C (or ARRIRAW) footage is loaded into a color correction system. A 3D LUT is then used to convert...
60 fps), p - 3G 444 HD (SMPTE ST425-3, up to 30 fps), p - 6G 422 UHD (SMPTE ST2081-10, up to 30 fps), p SDI 1 SDI 2 Configuration Fully configured or clean Clone of SDI 1 or clean Output...
introduced: PQ and Hybrid Log Gamma (HLG).
Use the ARRI Color Tool (ACT) to create ARRI’s Look File 2 to use in ALEXA SXT, ALEXA Mini and AMIRA. Based on a Log C-clip or a *.dpx still frame you can create looks using Color Decision...
well as: Genuine ASC Color Decision List Creative Modification Transform (Log-to-Log 3D-LUT) Use of a custom DRT or stay with-in ARRI Color Management Find out more about the ARRI...
MON OUT 1 and MON OUT 2 can each output either a 422 1.5G single link HD-SDI (1920 x 1080) signal or a 422 6G single link UHD-SDI (3840 x 2160) signal. MON OUT 3 can output a 422 1.5G single link...
Both cameras use our new REVEAL Color Science. REVEAL introduced a new Log C curve (LogC4) for ARRI Wide Gamut 4 color space to make use of the advancements made in sensor technology for...
ARRI offers a software development kit (SDK) for ARRIRAW processing that software vendors can incorporate into their application. ARRI also supports vendors who wish to implement the ARRIRAW...
The ARRIRAW T-Link (Transport Link) had been developed for ARRIFLEX D-20/D-21 (and was used in early ALEXA cameras/"ALEXA Classic") to utilize a standardized HD-SDI interface...
