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Showing Results for "log"

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254 search results found
Image of a diver rendered one half Rec 709/one half bare LogC4

Log C

Log C

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Log C

What is Log C?

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. What is Log C?

What is Hybrid Log Gamma (HLG)?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. What is Hybrid Log Gamma (HLG)?

ARRI LogC3 "ALEXA Log C curve in VFX"

White paper - not valid for ALEXA 35

pdf 272 KB
  1. Learn & Help
  2. Camera & Workflow
  3. Technical Downloads
  4. ARRI LogC3 "ALEXA Log C curve in VFX"

Do I loose any information going to Log C?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. Do I loose any information going to Log C?

Why is ARRIRAW data output as Log C for grading?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. Why is ARRIRAW data output as Log C for grading?

HDR Multicam Log C based Workflow for PQ and HLG

pdf 924 KB
  1. Camera Systems
  2. ARRI Cameras
  3. ARRI Multicam System
  4. HDR Multicam Log C based Workflow for PQ and HLG

Why does ARRI store 16 bit linear images in a 12 bit log format?

FAQ

16 bit linear encoding is neither efficient nor necessary for recording images. Images can be converted from 16 bit linear to 12 bit log without any loss of information or quality, but with...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. Why does ARRI store 16 bit linear images in a...

ARRI Look Library LogC4 (Look Files)

Look files for ALEXA 35 (*.alf4 files, log-to-log).

zip 16 MB
  1. Learn & Help
  2. Camera & Workflow
  3. ALEXA 35 Workflows
  4. ARRI Look Library LogC4 (Look Files)

What is the easiest way to use a LUT from the Look Library with Alexa 35 footage in post production?

FAQ

To use the Look Library in post production, download the Log-to-Log version for ALEXA 35 here .Please keep in mind that those need to be need to be combined with the ARRI official...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. What is the easiest way to use a LUT from the...

ARRI Look Library LogC4 (3D-LUTs)

Collection of log-to-log 3D LUTs for post production. Use for footage shot with ALEXA35.

zip 220 MB
  1. Learn & Help
  2. Camera & Workflow
  3. ALEXA 35 Workflows
  4. ARRI Look Library LogC4 (3D-LUTs)

ARRI Look Library LogC3 (3D-LUTs)

Collection of log-to-log 3D LUTs for post production. Use for footage shot with ALEXA Classic, ALEXA Mini, AMIRA, ALEXA 65, ALEXA LF, or ALEXA Mini LF.

zip 29.8 MB
  1. Learn & Help
  2. Camera & Workflow
  3. Technical Downloads
  4. ARRI Look Library LogC3 (3D-LUTs)

Can I use ARRI Look Library looks to create new looks?

FAQ

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...

My images seem to be lacking contrast/look washed out/too dark – what’s the issue?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. My images seem to be lacking contrast/look...

Is it possible to use the Look Library Looks in our color grading system and use them as starting point for color grading?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. Is it possible to use the Look Library Looks in...

I’ve created a look in our color grading tool. How can I apply this look in the camera, and embed it in the camera output?

FAQ

Generally speaking you need to export the look as a 3D-LUT and build this into an ARRI Look File. For ALEXA 35 this needs to be a Log-to-Log 3D-LUT based on actual Logc4 footage; the...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. I’ve created a look in our color grading tool.

ARRI Look Library LogC3 (Look Files)

Look files for ALEXA Mini, AMIRA, ALEXA SXT, ALEXA 65, ALEXA LF, and ALEXA Mini LF (*.aml files, log-to-Rec 709).

zip 36.9 MB
  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. ARRI Look File
  5. ARRI Look Library LogC3 (Look Files)

What is the bit depth of ARRI’s color processing and how are images stored?

FAQ

Images in the camera are processed in 16 bit linear and then encoded in 12 bit log on the recording medium. 

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. What is the bit depth of ARRI’s color...

Where can I get the ARRI Look Library for my next project?

FAQ

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,...

Why do I need LUTs when grading ARRIRAW footage?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. Why do I need LUTs when grading ARRIRAW footage?

What HDR Standards exist for mastering?

FAQ

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

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. What HDR Standards exist for mastering?

Normalized & Photometric conversion – When is it used and which should I use when?

FAQ

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...

Do I need special software to edit/post produce a HDR movie?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. Do I need special software to edit/post produce...

What is Wide Gamut?

FAQ

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 with...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. What is Wide Gamut?

How do you monitor HDR on set with ARRI cameras?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. How do you monitor HDR on set with ARRI cameras?

Does the WiFi radio in the ALEXA LF and SXT W offer access point and client mode?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Wireless Video System FAQ
  4. Does the WiFi radio in the ALEXA LF and SXT W...

What is the difference between ARRI Look File 1 (ALEXA Classic and ALEXA XT) and ARRI Look File 2 (AMIRA, ALEXA Mini, ALEXA LF and ALEXA SXT)?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. What is the difference between ARRI Look File 1...

Are there reference images available to verify that an ACES pipeline is producing correct results?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. ACES
  5. ACES FAQ
  6. Are there reference images available to verify...

If my camera is not calibrated, how do I get the 4K UHD calibration?

FAQ

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.

  1. Learn & Help
  2. Camera & Workflow
  3. AMIRA FAQ
  4. If my camera is not calibrated, how do I get...

Is it possible to up-convert an SDR master to HDR?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. Is it possible to up-convert an SDR master to HDR?

How can I convert a 3D-LUT (*.cube) to a LUT for ALEXA 35?

FAQ

All 3D-LUTs you want to use in ALEXA 35 need to be converted to an ARRI Look File 4. You can use our ARRI Reference Tool to convert the LUT for ALEXA 35. Keep in mind that we have changed our look...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. How can I convert a 3D-LUT (*.cube) to a LUT...

What’s the difference between ARRI Look File 2 (ALF2) and ALEXA 35’s ARRI Look File 4 (ALF4)?

FAQ

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)...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. What’s the difference between ARRI Look File 2...

What is ARRIRAW?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. What is ARRIRAW?

What is the dynamic range of an ARRIRAW file and how does it compare to ProRes?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. What is the dynamic range of an ARRIRAW file...

How do I record HDR with ARRI cameras?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. How do I record HDR with ARRI cameras?

How do I handle ARRIRAW files for VFX work?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. How do I handle ARRIRAW files for VFX work?

Can I record a baked-in look?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. ALEXA Mini LF FAQ
  4. Can I record a baked-in look?

What HDR standards exist?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. What HDR standards exist?

How can we see HDR images at home?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. How can we see HDR images at home?

What are the capabilities of the Mini LF SDI outputs?

FAQ

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...

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  3. ALEXA Mini LF FAQ
  4. What are the capabilities of the Mini LF SDI...

How does an HDR sample workflow look like?

FAQ

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...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. How does an HDR sample workflow look like?

What is an EOTF?

FAQ

introduced: PQ and Hybrid Log Gamma (HLG).

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  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. What is an EOTF?

What is the ARRI Color Tool (legacy)?

FAQ

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...

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  3. Image Science
  4. Color FAQ
  5. What is the ARRI Color Tool (legacy)?

What output standards do the ALEXA LF MON OUTs support?

FAQ

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...

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  2. Camera & Workflow
  3. ALEXA LF FAQ
  4. What output standards do the ALEXA LF MON OUTs...

What development options do I have when processing ARRIRAW?

FAQ

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...

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  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. What development options do I have when...

What is T-Link (Legacy)?

FAQ

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...

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  2. Camera & Workflow
  3. Pre- & Postproduction
  4. ARRIRAW FAQ
  5. What is T-Link (Legacy)?

How can I convert an ALF2 look file to ALF4 for ALEXA 35?

FAQ

ALEXA 35 uses our new REVEAL Color Science. REVEAL introduces a new Log C curve (LogC4) for the new ARRI Wide Gamut 4 color space to make use of the advancements made in sensor technology...

  1. Learn & Help
  2. Camera & Workflow
  3. Image Science
  4. Color FAQ
  5. How can I convert an ALF2 look file to ALF4 for...

AMIRA & ALEXA Mini - Color by numbers

White paper

pdf 1.7 MB
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  3. Technical Downloads
  4. AMIRA & ALEXA Mini - Color by numbers

Should I grade HDR or SDR first?

FAQ

not be happy with the SDR.  When using the 3D LUTs from ARRI for HDR and SDR grading and performing all grading decisions in Log C space (the 3D LUT is used as the last grading step)...

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  2. Camera & Workflow
  3. Image Science
  4. HDR FAQ
  5. Should I grade HDR or SDR first?

Cinematic Multicam in HDR

AMIRA supports workflows for live multi-camera productions in HDR according to BT.2100  Hybrid Log Gamma (HLG) or Perceptual Quantizer (PQ)  Cost efficient multicast HDR and SDR workflow...

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