Canon EOS C300 Broschüre & Specs - Seite 5

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Canon Log Gamma

The incredible 12-stop dynamic range of the Canon Super

35mm CMOS image sensor in the EOS C300 cannot be

contained within typical transfer functions such as Rec 709.

To make sure users can make use of the full dynamic range,

Canon has developed a Canon Log Gamma Curve that is

specifically tailored to the characteristics of the image

sensor. This allows the camera to originate and digitally

record the maximum exposure latitude of 12 stops. The Log

Gamma Curve is implemented at a high bit depth and then

down-converted, recording the data internally using the

8-bit 4:2:2 Canon XF Codec. The curve is precisely

mathematically specified to facilitate post-production

processes that seek to restore the linear light transfer

characteristics of the image sensor. (More technical

information about the importance of Canon Log Curves is

contained within a White Paper that can be downloaded

from the Cinema EOS website: cinemaeos.usa.canon.com)

DV III Image Processor

≥

Taking full advantage of the enhanced image resolution

offered by a Super 35mm CMOS sensor, the EOS C300's

purpose-built high-speed

DV III Image Processor

≥

helps to ensure that the trio of 2-megapixel HD Video

components for Red, Blue and Green converted from the

large 8.3 megapixel single-sensor are accurately processed

in a manner that produces excellent tonal and color

reproduction. This processor's highly sophisticated and

proprietary architecture supports flexible operational video

control over a wide range of video image parameters that

empower creative choices on set – including the special

Custom Pictures mode of operation as well as Canon Log

Gamma. Image inversion can be invoked if depth-of-field

converters or other lens adapters are used. This processor

also implements the Peripheral Illumination Correction feature.

Canon MPEG-2 4:2:2 50 Mbps XF Codec

The EOS C300 records in MPEG-2 4:2:2 50 Mbps XF Codec,

offering over 80 minutes of footage on a single 32GB CF

Card. Not only does the efficient compression allow for long

record times, this internally recorded codec retains robust

color information for color correction and chroma keying

while still working seamlessly with stringent broadcast post-

production pipelines as well as ensuring compatibility with

major NLEs. If desired, EOS C300 users can also select

lower bit rates of 35 Mbps 4:2:0 or 25 Mbps 4:2:0 for even

longer record times.

Custom Pictures

With tight deadlines and certain quick-turn applications that

don't have time for color correction, there are often

circumstances when cinematographers want to create a

great preset look in-camera that is ready for air. Custom

Pictures allow users to creatively express themselves

through a myriad of custom controls. Cinematographers can

customize the look of the EOS C300's image by changing

the camera's video processing parameters, including Gamma,

Black, Black Gamma, Low Key Saturation, Knee, Sharpness,

Noise Reduction, Skin Detail, Selective Noise Reduction,

Color Matrix, White Balance, Color Correction, and Setup

Level. Custom picture settings can be saved in-camera or to

an SD media card for sharing between multiple cameras.

Gamma and white balance adjustments can be made

intuitively using a series of graphical user-interface/GUI

displays that show, for example, gamma curves both before

and after making potential changes. Similarly, for white balance

adjustment, a color/plane display enables the direction and

amount of compensation to be seen at a glance.

Canon Log Gamma

Normal 1

Canon Log

INPUT

Helps ensure tonal reproduction for both highlight and lowlight regions

during post-production.

EOS C300 and EOS C300 PL – ISO and Dynamic Range

Specifications (Canon Log, Progressive Scan)

S/N

18%

GAIN

GRAY

ISO

Ratio

ISO

41dB

6.7 Stops

30dB

5.3 Stops

20000

ISO

45dB

6.7 Stops

26dB

5.3 Stops

12800

ISO

50dB

6.7 Stops

20dB

5.3 Stops

6400

ISO

53dB

6.7 Stops

14dB

5.3 Stops

3200

ISO

54dB

6.7 Stops

5.3 Stops

8dB

1600

Canon Log

ISO

Base

54dB

6.7 Stops

2.5dB

5.3 Stops

850

Sensitivity

ISO

54dB

6.8 Stops

2dB

5.2 Stops

800

ISO

54dB

7.1 Stops

4.9 Stops

0dB

640

ISO

54dB

7.8 Stops

-4dB

4.2 Stops

400

ISO

54dB

8.1 Stops

3.9 Stops

-6dB

320

XF Codec Quality Chart

4:2:2

Color difference signals: B-Y(Pb) Color difference signals: R-Y(Pr)

4:2:0

Color difference signals: B-Y(Pb) Color difference signals: R-Y(Pr)

These illustrations represent a color image converted to RGB, after which

each component signal is converted to monochrome. Since B-Y and R-Y

signals lack a brightness component and only indicate saturation, images

produced from them look quite unnatural to the human eye. To avoid

confusion, the illustrations are produced by conversion to monochrome

and then, for convenience, conversion of saturation to brightness.

Frame grab from the Sam Nicholson, ASC, film "XXIT," shot in Canon Log mode.

Frame grab after color grading.