Blackmagic Cinema Camera post workflows

Digital camera development has been running in high gear for several years outpacing any other portion of our industry. Thanks to a revolution started by RED, Nikon and Canon, videographers are now blessed with a wide range of small, affordable, high-performance imaging systems that have broken us free from the confines of the mundane 2/3” video camera. The newest entrant is the Blackmagic Cinema Camera introduced by the industry’s favorite disrupter, Blackmagic Design. Marked by a small form factor, QuickTime or camera raw recording and a $3K price tag, Blackmagic has been able to bring to market a product that seems to have eluded many other seasoned camera manufacturers.

The basic engineering design of the Blackmagic Cinema Camera is a “sandwich” of an EF or MFT (Micro Four Thirds) lens mount, a recording device based on the HyperDeck Shuttle and a touch screen/viewfinder. It records either 1920×1080 ProResHQ QuickTime movie files or 2400×1350 CinemaDNG camera raw image sequences. (Version 1.1 software was recently released, which adds Avid DNxHD support.) The high-def QuickTime files are downsampled from the 2.5K sensor. With CinemaDNG selected, each clip is treated as a folder of individual frames, plus a broadcast wave file. Each time “record” is pressed, a new folder is created for that clip. The camera raw files maintain the full sensor resolution, allowing for high-quality reframing and digital zooms in post.

This isn’t a camera review, so I’ll leave the discussion of the merits of the camera in the field to others. Since the BMCC offers new options to filmmakers, it’s important to understand how to handle these files in post. (Click any of these images for an expanded view.)

Understanding camera raw

Camera raw is not an acronym. The term refers to a file that has not gone through full processing to produce a final RGB image. The full dynamic range of the sensor’s ability to capture light is maintained in raw images. Different manufacturers use different camera raw methods and profiles for individual models. When you get frequent software updates to Apple Aperture or Adobe Photoshop, it’s often to add new camera profiles to keep current with the latest Canon or Nikon offerings. In most camera raw images, ISO/exposure and color temperature/tint values are represented as metadata recorded by the camera at the time the image was captured. As metadata, it can be altered in post and isn’t “baked in” as a permanent part of the image – as it would with a TIFF or JPEG still. If a camera raw image appears to be slightly overexposed, post processing software allows you to recover the highlight detail by changing the ISO or exposure values.

Adobe launched an initiative to create a common camera raw format as a type of “digital negative” file, which became the DNG standard. This was released as open source software and is available for manufacturers to use in their products as DNG (stills) and CinemaDNG (motion), thus eliminating the need to create their own new, proprietary camera raw file format. Blackmagic uses this CinemaDNG file format for its raw image sequences, which means that a wide range of applications can read, open and import these files natively. Those that include camera raw importer modules also enable you to alter the recorded settings within that application.

Correctly importing camera raw images is important. For instance, Apple Final Cut Pro X will natively read the BMCC’s CinemaDNG files, but it currently has no raw importer settings. If the “as shot” metadata makes the image appear overexposed with clipped highlights, you cannot recover that detail from within FCP X. Likewise, not all camera raw importers use the same values. An image opened at the default or the “as shot” value in DaVinci Resolve will look different than in an Adobe application. The beauty of raw, though, is that the image is within an adjustable range and any of these importers will give you good results with a few tweaks.

Image sequence workflows

Blackmagic Design includes a full copy of DaVinci Resolve 9 with the purchase of the camera and that’s obviously their recommended tool for producing editing “dailies” and final color correction. Since DNG is a still photo format, grading and conversion can be handled in other applications, too, including Adobe Photoshop, Lightroom, After Effects and Apple Aperture. Each of these applications includes camera raw controls to get the most out of the image. Currently, you cannot import the camera raw files directly into Avid Media Composer, Apple Color or Adobe Premiere Pro. SpeedGrade (with the latest updates) will read the files, but offers no specific camera raw adjustments. There the default import of CinemaDNG files renders a flat, log-style image as a starting point.

The following is a simple workflow using a photography application, such as Lightroom or Aperture. Import each folder of CinemaDNG files into the application. Now select a representative frame within that group and apply your adjustments. Since these are full-featured color correction tools, go as extreme as you like, if you intend to create the final look at this time. Once you get the appearance you want, copy-and-paste those settings to the other images in that folder. These are non-destructive changes within Lightroom and Aperture and may be altered at any time in the future. Next, export the adjusted versions as a new set of TIFFs to a separate folder on your hard drive. These TIFFs will contain the “baked in” look you have just created.

The process is a bit different in Photoshop, but there you have the option of using one of the many special tools and filters to create unique looks. For example, you can apply an oil paint or dark strokes effect for an artistic, painted style. Open a representative frame from a shot and apply the settings you want to use. As you do this, record the steps as a Photoshop Action. When you are happy with the look, use Photoshop’s Batch function to apply this saved Action to all the frames in a folder for each shot.

The CinemaDNG files are 5MB/frame in size, while the exported TIFFs are 9.8MB each. It is possible to open a TIFF image sequence in QuickTime 7 and save it as a QuickTime reference movie. That, in turn, can be used as an editing source in Final Cut Pro 7 and X. As a reference movie, if you update the files later by re-exporting TIFFs with a new look, the reference movie will also be updated to reflect these new files. FCP X offers a performance edge by being able to play these 2.5K sequences natively in real-time within a 2K or HD timeline. QuickTime reference movies are 8-bit, but I saw no visual difference when comparing these files to 10-bit uncompressed and ProRes4444 exports. I would recommend that you transcode these to proxy editing files in FCP X if you opt for the QuickTime reference method.

After Effects offers another solution. You can open CinemaDNG image sequences, make adjustments with its camera raw importer, and then render out final, graded movie files. Naturally, plug-ins like Magic Bullet Looks add more options for custom styles. If you opt to first convert the DNG sequences to TIFFs using Lightroom or Aperture, then Avid Media Composer and Symphony will auto-detect the files as an image sequence and import them as a single media file.

DaVinci Resolve 9

DaVinci Resolve 9 is an advanced grading tool, but may also be used simply to turn the image sequences into a set of flat-looking QuickTime movie files, suitable for color correction later. Resolve 9 now includes a camera raw settings tab. Tweak the settings and then export each clip as a separate movie file. Blackmagic Design has implemented BMD Film with this camera. It’s a log-encoded color space and gamma profile that resembles ARRI’s Log-C. This profile may be selected in-camera for the QuickTime files, but may also be used as a preset in the Resolve 9 raw module (also available in the free Lite version).

So far, my testing has been limited to the handful of clips by Australian DP John Brawley. These are sample shots from the short film Afterglow, which was produced to showcase the Blackmagic Cinema Camera. Brawley has posted several shots online in both CinemaDNG and ProResHQ formats. The QuickTime files from the camera were encoded with the BMD Film profile, which matches the same setting when applied to camera raw files converted through Resolve 9.

BMD Film

The option of using After Effects, Photoshop, Lightroom or Aperture gives users an interesting new toolset for creating stunning images; but, for most, there’s a comfort factor in using your favorite NLE or grading software. I believe the majority of users will probably stick to shooting ProResHQ files using the BMD Film log profile, because it’s a proven workflow. It preserves the dynamic range and gives you most of the latitude available from the CinemaDNG files. Camera raw files exported from Resolve 9 as ProResHQ using the BMD Film preset (without other correction) are identical to the appearance of the QuickTimes recorded in-camera. The ARRI ALEXA also shoots raw and Log-C, which makes the BMCC are interesting option as a sort of “baby ALEXA”. I haven’t intercut clips from a project that was shot with both an ALEXA and the Blackmagic camera yet, but I suspect the BMCC would work well as a good B or C camera in this type of production.

When I take the BMD Film-encoded clips into Final Cut Pro 7 or X, the values are close enough to Log-C that I can use many of the same LUTs and filters. For example, the Pomfort Alexa Look2Video filter that I use to correct Log-C into Rec 709 works equally well with BMD Film. I’ve done grading tests using a range of NLEs and color correction software and have been very impressed with the results from these Afterglow test clips. Working with the CinemaDNG or ProResHQ BMCC clips will fit into established workflows, without the need to learn new, proprietary tools. No matter what your preference – Avid, FCP X, Premiere, After Effects, Color, Resolve, Photoshop, etc. – this is one new camera that was designed with post in mind first.

Click here to see a variety of grading examples.

Originally written for Digital Video magazine.

© 2012 Oliver Peters

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Grading through digital bipacks

When you hear someone use the term bipack, you think they are making the word up or just BS’ing you. In fact, bipack refers to an old technique used to create in-camera film effects. Film timers also used the technique to create certain color effects. In modern times, we are really referring to ways that involve blending or superimposing images and this has a direct relationship on tricks you can use in color correction.

The concept of blending two images with different values is a lot like working with layers and blend modes in Photoshop. Some color correction applications, like SpeedGrade, also use a Photoshop-style system of layers. You aren’t limited to color correction applications, though, because these exact same tricks can be used in any NLE. For example, editors have frequently built a look referred to as “instant sex”, which is a technique for adding highlight glows by compositing copies of the same clip on two video layers. The process is easiest with NLEs and compositors like Motion or After Effects that offer composite modes. I find Apple Final Cut Pro X to be a good NLE for these tricks, because the interface design makes it easy to blend and adjust two stacked clips.

I’ll cover several quick examples of how you might use this technique. (Click any of these images for an expanded view.) For clips, I’ve grabbed shots from Afterglow, a short film photographed by John Brawley to promote the release of the Blackmagic Cinema Camera. The source clips are QuickTime ProRes files was a BMD Film (flat, log) gamma profile. To these I’ve added a Pomfort LUT filter normally used for ARRI Alexa Log-C. This corrects the clips back to their intended REC 709 appearance and becomes my starting point.

To stack clips in FCP X, simply edit the clip to the primary storyline and the option-drag it up to duplicate a version as an in-sync, connected clip. Since composite modes often create illegal video levels, I place an adjustment layer clip (a modified Motion title) on top, with a broadcast safe filter added to it.

In this first example, the bottom clip is changed to black-and-white by reducing the saturation in the FCP X color board. The top clip’s composite mode is set to Soft Light. Grading for the right tonal qualities becomes a dance between the settings on the two layers and the opacity value of the top clip’s compositing mode.

If I add a Gaussian blur to the lower clip, change the compositing mode of the top clip to Overlay and tweak the color board settings of the two clips, the look changes from harsh to glamour.

In this billiards shot I’m using the Soft Light mode again, but this time I have tinted the lower clip to a slight teal cast. The top clip is a vibrant orange, but the combination of the two ends up with the more normal-looking and popular orange-and-teal grade.

In this balcony shot I’m using the Overlay mode and have added a slight directional blur to the top layer. The bottom layer is desaturated with a slight tint while the top layer is more vibrant. Combined they have a high-contrast, bleached look.

In this final example, I’ve reversed some items. The top layer is set to the Multiply mode at 80% opacity and I’ve made it black-and-white. The color correction is again a matter of compensating between the two layers to get the right feel.

When I add a Gaussian blur to the top clip the look changes from harsh to a nice, diffused appearance.

© 2012 Oliver Peters