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Frequently Asked Questions:
 
 

 

 
Question
How is 3cP proven to save productions time and money?
 
Gamma's Answer

The main way that the use of the 3cP system will save production time and money is simply due to dramatically cutting down post-production time. For example, Ousama Rawi, BSC is using 3cP for his current project "The Tudors, Season 3" and they have budgeted about two weeks for color correction. When he uses 3cP, the time is cut down to two to three days. So not only is this cutting post-production cost, but it also speeds up production.

 
 
Question

How easy is it for 3cP to incoporated into production?

 
Gamma's Answer

3cP can be easily incorporated into any production. There are a few simple steps for both sides to take when bringing the 3cP system into the workflow. These steps are handled by us and we wil make sure every step necessary is completed before photography begins.

 
 
 
Question
What if my post production facility does not support the ASC-CDL workflow? Can I still use 3cP in my production?
 
Gamma's Answer

Yes of course. 3cP is extremely compatible with multiple forms of output files for any programs. We can output LUT files to Scratch, Lustre, Da Vinci 2K, Color Finesse, Pogle, LUTher, and many more.

 
 
 
Question
Is 3cP designed to work with a specific color correction system? 
 
Gamma's Answer
Gamma & Density does not tailor 3cP to any specific color corrector. Our goal is to give the DP who is working in any country, at any budget, with film or digital, the ability to control his images with all color correctors in the world, including da Vinci, Pogle, Lustre, Color Finesse, Apple Color, Chrome Matrix, and Speedgrade DI. 
 
 
 
Question
What methods of transferring color data from production to post-production does 3cP support?
 
Gamma's Answer
3cP supports a variety of methods of encapsulating your color corrections so they can be transfered to another color correction system in post-production. It supports the ASC CDL, a variety of 3D LUT formats, direct interfaces to Apple Color and Synthetic Aperture's Color Finesse, Technicolor's Digital Printer Lights, as well as 3cP's own reporting system. 
 
 
 
Question
What formats of 3D LUTs does 3cP support?
 
Gamma's Answer
3cP supports 3D LUTs compatible with Autodesk Lustre, Pogle, Scratch, an Truelight. The Autodesk/Discreet LUT format in particular is supported by many color correction systems. 
 
 
 
Question
What is an ASC CDL?
 
Gamma's Answer
The American Society of Cinematographers Color Decision List (ASC CDL) is a format for the exchange of basic primary color grading information between equipment and software from different manufacturers. The format defines the math for three functions: slope, offset and power. Each function uses a number for the red, green, and blue color channels for a total of nine numbers comprising a single color decision. A tenth number for saturation is included in the latest revision to the standard. The ASC CDL was developed by the ASC Technology Committee, a combined group of cinematographers, post-production engineers, and other motion picture industry professionals. 3cP supports the XML schema for encoding the ASC CDL.  
 
 
 
Question
What is the advantage of using the ASC CDL over 3D LUTs?
 
Gamma's Answer

The ASC CDL has the advantage of being "soft" with each color correction parameter being adjustable and removable. LUTs, on the other hand, have all color corrections combined into one big "blob" with no ability to later tweak or remove those corrections. Because color adjustments can easily be modified (or removed) without having to start over, the ASC CDL allows color decisions to be made progressively.

An initial set of looks can be designed during pre-production and saved as ASC CDLs. These can be applied on-set and tweaked to account for the actual scene in question, taking into account the final lighting, art direction, etc. that weren't locked down in pre-pro. These adjusted CDLs can be sent to the dailies colorist where they can be further tweaked in the more controlled environment of the color suite.

Finally, the dailies colorist's modifications can be saved as new CDLs and used by the DI colorist as the starting point for the final color correction. And, once again, all the settings are "soft" so they can easily be refined, adjusted for telecine vs. scan differences, etc.

 

At any point along the way the ASC CDL settings can be exported as a 3D LUT and loaded into a LUTher, GDP, PIP, etc. for live viewing of digital productions, or combined with existing print emulation LUTs (Truelight, etc.) for projection. Both 3D LUTs and the ASC CDL have important roles to play, but it's the "softness" and the cross-vendor support for the ASC CDL that is exciting.

 
 
 
Question
So what are the disadvantages of using an ASC CDL-based workflow?
 
Gamma's Answer
The color correction controls supported within the ASC CDL currently prevent you from using free-form color adjustment curves--such as supported in 3cP--when color correcting. To make sure that you don't use any color correction controls which the ASC CDL can't support, 3cP has an "ASC CDL Project" setting which alters the user interface for ASC CDL-based projects.
 
 
 
Question
How much time does it take to use 3cP? I'm already busy and out of time during production!
 
Gamma's Answer
Our experience is that each DP is different in how much time they want to spend on color correction. Most spend the biggest chunk of time during pre-production, devising looks--which make sense since you really don't want to have each scene look different. Some then refine the look on-set, others do it at the end of the day. Some do it all themselves, some have everything done by an assistant. But in any case it doesn't consume much time, compared to the advantage of being able to see their footage as intended. And since they know any of their color decisions can be revised (or removed) later, there is no particular pressure to "get it right" just then. If the day is particularly hectic they can ignore it or just use a canned look. Many DPs continue using 3cP at home with our Proof Roll feature to prepare for DI and final color correction long after the picture is finished.
 
 
 
Question
What is the Proof Roll feature?
 
Gamma's Answer

The Proof Roll feature presents all of the color corrections done on set in editorial order, allowing the DP to finetune the color corrections before starting the DI session. The desired look may have evolved since production, and tweaks may be needed to ensure scene-to-scene continuity, so this extra step saves time performing the same tweaks in the DI color correction suite, potentially giving significant savings in time and money.

 
 
 
Question

How can an LCD monitor on the set match what the colorist sees? I've heard that

LCDs can never match CRTs or projection.

 
Gamma's Answer

It's true that different display technologies have different visual characteristics that make it hard to acheive a precise match. The Sony BVM series of CRT monitors has long been considered the "gold standard" for use in color correction suites. Unfortunately, they are no longer being made, nor are many CRTs of any quality being made. The CRT is dead due to economic and environmental issues.

There are high-end LCD displays which approach the quality of CRT displays, and even exceed the CRT in some parameters. However, their cost make them impractical for use on the set. But even if you had a choice of the perfect monitor, other factors conspire to make sure that you will never have a precise visual match. The viewing environment, for example, is never perfect during production. There is probably not enough time to allow your eyes to adapt to whatever environment you do have. These and other factors outweigh any difference between monitors, ensuring that the display type is not the weakest link in the viewing chain.

 
 
 
Question
So there will be differences. Then what is the point?
 
Gamma's Answer

Keep in mind that in communicating the desired look of the image, the intent is much more important than absolute numbers. The DP as an "artist" thinks in relationships between light and shadow, and relationships between colors and hues. As a great French painter Ferdinand Victor Eugène Delacroix once said "Give me the freedom to use the paint of my choice for a background, and I'll make street dirt look like the skin of Venus." A cinematographer wants to preserve those relationships. They are his tools; the tools of his art.

 

An ability to "preserve" the cinematographer's vision in the form of RELATIONSHIPS (not absolute numbers!) between luminance and hues in the details of an image is one of the most important advantage of using an on-set color-correction system.

 

If the sky on a 3cP monitor on-set measures 25 foot-Lamberts and a face is 10 ft-L, and in the DI screening room the sky is 27 ft-L and the face is 11 ft-L, then to our "imperfect" eye it is a "perfect match"; the ratios are the same. It is how our eyes work. There is a law (called the Weber-Fechner law, dating back to the 19th century) that describes the difference between seeing things/objects and seeing their images; explaining the difference in perception of tones and colors. This unavoidable difference outweighs all the imperfections in monitors, viewing environments, etc.

 
 
 
Question
If I don't have a perfect match in colors, what is 3cP communicating from the DP to the colorist?
 
Gamma's Answer

It's more than just color. While there are many types of DPs, some of them really know what they have in mind, and what the image is supposed to look like. When they finish lighting, framing, etc., they have a very clear idea about what kind of contrast (lighting ratio) the fact of actor A must have, as opposed to the contrast of the face of actress B, and that the color of the shirt must be mauve as designed, not rose, and the sky on the background must be 2 stops below the key. And this was all thought through and designed, and needs to be seen in dailies, DI and in the DVD release. Those cinematographers are our main and repeat clients. And we give them tools not to look nice, but to keep their artistic integrity intact and transferable through all incarnations of the image.

 
 
 
Question
Do I need to use a special monitor when using 3cP?
 
Gamma's Answer
No, although you should choose a quality monitor. We've successfully used the Apple Cinema displays as part of the 3cP on-set color correction system on many projects, matching them to both telecine and DI suites, and to Rec 709, NTSC, and PAL in order to give our clients, the DP on the set, the same viewing experience the colorist will have in his suite.
 
 
 
Question
How can I calibrate my monitor for use with 3cP?
 
Gamma's Answer

3cP contains a built-in monitor calibration tool which you can use by itself or in combination with other calibration systems.

You can use a hardware calibrator like the Spyder Pro, but be sure you are calibrating to your intended delivery system (HD, NTSC, PAL) and not for pre-press use which may spec very different color temperature and gamma.

 

By using the built-in Apple calibration tool as the first step of calibration, and then adding our internal 3cP calibration tools, we can testify that Apple monitors are quite accurate, and able to show practically the same quality of image as any tele-cine monitor. We've demonstated this to many our clients--DPs and colorists both--using the G&D chart as a testing tool. The use of the chart as a calibration tool also showed to us long time ago that using the same numeric gamma and color temperature settings on the Apple monitor and in telecine does not provide the same visual result.

 

An important thing to keep in mind is that it's not just the monitor but also the video card that must be calibrated. The same monitor and calibration settings will look different on a different computer. That's why we always calibrate the card and monitor as a pair.

Practical experience--not just theory--shows that Apple monitors are capable of reproducing practically the full range of hue and colors comparable to the best telecine monitors, if they are used and calibrated properly, i.e. calibrated as a pair with the same computer, using software which allows you to calibrate the monitor more accurately than Apple's built-in utility. The resulting calibration should be checked periodically--visually and instrumentally--against the intended delivery system, by using as consistent test image such as the G&D chart, which contains calibrated gray patches with a predefined relationship between output millivolts and exposure.

 
 
 
Question
How can we optimize the viewing environment on the set for the 3cP monitor?
 
Gamma's Answer
Shading the monitor with a hood, or putting it in a blacked-off section of the camera truck usually does the trick, because with the 3cP system we are always using the patented G&D chart as a reference. Letting our imperfect (i.e., human) eyes know what is a neutral gray (45 IRE or 300 mV), and what is white or black, we allow the eye of the observer to adjust the color vision to the appropriate level.
 
 
 
Question

What's the deal with the Gamma & Density chart? Can't I just use a graycard to ensure

that my footage remains neutral in color?

 
Gamma's Answer
The chart provides an automated way to determine not only neutral gray, but black and white levels, gamma, and color saturation, providing a way to deal with virtually any camera, regardless of the camera's imaging system. Once an image is calibrated, a 3cP watermark (another part of Gamma & Density's calibration system and sort of a mini version of the chart) is attached to it so that the calibration stays with the image throughout the workflow.
 
 
 
Question
If my goal is to save time in DI, shouldn't I just use whatever system the DI house is using?
 
Gamma's Answer

The DI house is rarely chosen before production starts, so it's not clear at the start what type of color corrector the on-set component will be feeding. With 3cP we've tried to make it easy to defer the choice of DI house by allowing direct transfer of color information to a variety of color correction systems, including Scratch, Pogle, DaVinci/LUTher, Final Touch, Color Finesse, and others.

 

This lets the colorist quickly establish not only the basic look, but the specific look which the DP is after, and it's this factor which saves time during the DI grading process. Time that can represent either a cost savings, or an opportunity to further exploit the power of DI instead of doing basic color correction, or some combination of both. Of course, the colorist can also manually dial in the look based on the on-set grade, but because 3cP supports many color correction systems directly (with more in the future), we reduce the need for that manual step, thereby increasing the productivity of the colorist, allowing him more time to color.

 
     
Question

(I use) photoshop on a macbook. …. how does it differ from what I've been doing up until now?

 

Gamma's Answer

 

 

 

 

 

 

 

 

 

 

Unlike Photoshop, our software not only modifies still digital images to emulate film stock and film processing characteristics, but also creates a very precise electronic characteristic of the shot in the form of waveform monitor and vectorscope representations.

 

The 3CP-color corrected still images are seen by a telecine colorist on the same monitor that he or she sees the neg image on. Mind you, all technical information, a.k.a. metadata (waveform monitor and vectorscope graphs) is also available to the colorist. This combination of an image and data very precisely conveys the DP's intentions. What's more, the colorist can store the transfer information and easily recall the necessary setting as needed.

 

Needless to say, to achieve the results we produce, we very calibrate the on-set monitor to very closely match the monitor in the telecine suite where the actual transfer is to take place.