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October 27, 2012

Color Science Versus Color Art with the Canon C300

As artists of a visual medium, we know when something looks "good" or "right" and we know something doesn't. Of course, "good" is a lot more subjective than "right," and that's part of the beauty of what we do. One of the things that directly determines such qualities of an image is the color science of the given camera we're working with. The color science of every manufacturer is different, and depending on the guts of the camera, each camera may differ as well. Art Adams at ProVideo Coalition has just posted a great, in-depth analysis of the various color matrices of the Canon C300 and what individual flair they bring to your imagery. Read on for some of his findings.

Here's a video in which C300 footage of Game of Thrones cast-members is graded to match Alexa's color personality (shot by Shane Hurlbut): [UPDATE: Video removed for copyright reasons]

Sometimes I get so caught up in how inexpensive, convenient, or small new camera technology is -- not to mention the quality of imagery it can produce -- that I sort of forget the importance of video monitoring devices like waveform monitors and vectorscopes. I suppose if we're working on a set equipped with a DIT, this is something we can let them worry about, but I think it can certainly help us in the creation of an image to know the nuts and bolts of what's going on to produce it. Mr. Adams's post reminded me of the value such awareness can have. To incorporate a likely-overused metaphor, it's a bit like a painter who knows his paints, brushes, and canvas, who is then able to use all that to his advantage. This is why I've always loved being a geek for gear -- in the hopes of one day being able to use some of the tech to the benefit of an artistic endeavor.

To get back to the C300 specifically, Art's findings are really interesting. Not to mention the fact that I'm a bit out-of-touch (literally speaking) with Canon gear as of late, so plenty of his post was new to me. Here's Art on the basic interactions of gamma and color matrix settings:

In the past I’ve leaned toward using Cinema1 or Cinema2 gammas and one of the Norm color matrices, usually Norm1. “Gamma” is all about how the camera maps brightness values and is completely separate from color matrices, even though they share the same names—for example, there’s a Norm1 color matrix and a Norm1 gamma, but they don’t need to be used together. The color matrix controls, in a very fundamental way, how the raw colors captured by the sensor are combined into a “look,” and this look is not only unique to each matrix but, to some extent, unique to each camera.

He goes on to discuss trying to find a balance in color matrix choice -- one with the amount of saturation (or desaturation in this case) he wanted, but also with accurate color rendering. He says that the C300 matrices generally push a little green into the reds, while blues and greens tend to be undersaturated. He does note that all the settings seem to preserve a healthy skin tonality, saying his "the reason most of their matrices skew red toward green is [likely] to make sure flesh tones -- which contain both red and green -- always look good."

He also explains the tendency of some colors to become noisy given the dominant temperature of a scene: blue can pick up noise in tungsten light because the camera must gain-up to maintain the right overall color balance with the low blue levels of 3200 K. Something similar can occur with red in daylight, where greens can become noisy due to gaining-down reds:

At first this makes no sense: why would subtracting a noisy signal from a clean signal result in noise? As best I can tell it’s because when you subtract a noisy signal from a clean signal you introduce noise into the clean signal, because you’re basically leaving holes in the clean signal where the noise was in the noisy signal. That’s a little bit of a mind blower, and it’s really cool if you’re a geek like I am.

Whoa. Art also differentiates accurate and "pretty" colors, just like the "right" versus "good" mentioned above. He says that "some of the prettiest blues have some green in them," but your color matrix rendering pleasing colors may not be what you're after from a technical standpoint: "This is the difference between accurate color and pretty color: all of these matrices can look very pretty in certain circumstances, but not all are color accurate." He says that during vectorscope demonstrations he was doing at NAB, he discovered the EOS Standard matrix to be the most dead-on accurate, but not desaturated enough for his tastes when used in the field -- he explains he had to gain down saturation settings significantly to arrive at the look he wanted (coupled with Cinema2 gamma setting for its handling of highlight detail).

I won't take anything else away from Art's great post, there's a lot more detail and insight there -- not to mention the color red screaming into the camera, in a manner of speaking. How has the C300's color performance compared to other cameras you've shot with (assuming you've shot with it or played with footage)? Has it struck anybody as noticeably different from other Canon models?

Link: CAMERAS: Thoughts on the Canon C300’s Color Science - ProVideo Coalition

Your Comment

6 Comments

All Canons love red, and have always 'leaned' that way. Sonys too until recently.
Great piece, especially if you're doing a shoot similar to the above.
Shortly we will see the BMDCC as Cam 2 so that will also be interesting matrix wise.

October 27, 2012

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marklondon

There always seems to be a noticeable "red" tint in all footage shot by Canons. It also seems to depends on the lens.

I've found that shooting with Zeiss lenses makes it cooler, while shooting with Canon L makes it warmer.

October 27, 2012

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TehRandax

Now that I think about it, my zeiss does seem to shoot a bit cooler than my canon lenses. I wonder what causes that effect? Maybe type of glass?

October 30, 2012

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It's usually the anti-reflective coatings that push colours around. Which is why a lot of people try to build sets of glass from the same manufacturer/era: saves time for colour matching.

October 30, 2012

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Adrian

Excellent article. This passage was kind of mind-blowing to me:

"The problem is that that EOS Standard matrix is way too saturated for my taste. People with unsophisticated artistic vision tend to like bright, “poppy” colors, as do children. As we grow older and more sophisticated we tend to drift away from enjoying pure red and blue and favor more subtle, sophisticated colors that are less saturated. "

It's crazy that what I thought was my process of self-discovery was really a predictable psychological response.

October 29, 2012

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Carlos D

Thanks for posting this. Another great article by the incomparable Art Adams. Art is definitely a tech geek - but he is able to explain complex concepts well. More importantly, he never loses sight of using his technical skills to better serve the story artistically. I generally like the Canon C300, but I've had some issues with colors being way off when using Canon Log. All of the blues were looking "turquoise." Of course it can be color corrected later, but it does make clients nervous. Like Art, I have switched to Cine 1 or Cine 2 gammas when necessary - but I prefer working in Canon Log when possible. I'm looking forward to trying his trick of desaturating EOS Standard.

October 30, 2012

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