Specifications

Canon Wide DR Gamma
To maintain many of the Log Curve’s benefits, while minimizing
the need for sophisticated post-production processing, the
EOS C100 oers Canon’s alternative new Wide Dynamic
Range Gamma function. Wide DR Gamma allows the sensor’s
full 12-stop (800%) dynamic range to be recorded, while
having the gamma correction throughout the midrange
maintain a resemblance to that of Rec. 709. Because
Wide DR Gamma retains a traditional IMAGE look and feel,
its use helps eliminate the need for extensive color grading,
thereby allowing workflows to be streamlined, yet still
retaining the sought-for dynamic range. Technically,
Wide DR Gamma retains the tonal range of an image, unlike
the more limited normal input/output knee function that
compresses the signals in high-brightness areas using
gamma adjustments.
Custom Pictures
Custom Pictures is a mode that oers the ability to expedite
the subsequent post-production process by facilitating a wide
range of video image look and feel while shooting on-set or on
location. This mode allows easy access to a large number of the
EOS C100 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 within
the 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.
AVCHD Codec
Unveiled in 2006, the AVCHD codec – standing for Advanced
Video Coding High Definition – has quickly become an
established worldwide standard for professional HD video
recording. AVCHD is based on contemporary MPEG-4
AVC/H.264 compression technology and features a maximum
recording bit rate of 24 Mbps in Full HD 1920 x 1080 pixel
resolution within a 4:2:0 color space on widely available SDHC
and SDXC media. This highly ecient codec facilitates the
extended recording durations that significantly augment the
one-person shooting capabilities of the EOS C100. A single
64GB card will record for almost six hours and the EOS C100
can deploy two such cards.
As well as supporting cost-eective digital HD image capture
in professional-grade video cameras, the AVCHD codec is
utilized by the majority of professional non-linear editing/
NLE software from such familiar vendors as Apple®, Avid®,
Adobe® and Grass Valley® – thereby expanding creative
production options while saving time and money. In addition,
the EOS C100 facilitates quick and easy conversion to
web-based content that will be streamed in an H.264 format.
Image in Wide DR Gamma
Image in Normal 1 Gamma
INPUT
Normal 1
OUTPUT
Canon Wide DR
Canon Log
Helps ensure tonal reproduction for both highlight and lowlight
regions during post-production.
Canon Wide DR Gamma & Canon Log Gamma
Canon Log Gamma
The Canon Super 35mm sensor’s exceptional 12-stop (800%)
dynamic range cannot be contained within typical video
gamma curves such as specified in Rec 709 – the ITU-R
Recommendation that standardizes the production format of
16:9 HD television. To ensure full utilization of such a wide
dynamic range, Canon has developed a Canon Log Gamma
Curve that is specifically tailored to the EOS C100 sensor’s
enhanced characteristics. The Log Gamma Curve is
implemented at a high bit depth and then down-converted,
recording the data internally using the 8-bit AVCHD codec.
This eectively retains the full dynamic range of the camera.
Data files produced using this 8-bit log format are perfect for
desktop post-production processing – during which image
corrections, color matching and grading can be applied –
thereby helping ensure a high level of creative freedom without
impairing image quality. The Log Gamma Curve is specified
mathematically to help streamline post-production processes
that seek to restore the image sensor’s linear light-transfer
characteristic. (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.)
Canon Log Gamma – ISO and Dynamic Range Specifications
(Canon Log, Progressive scan)
18%
GRAY ISOGAIN
5.3 Stops6.7 Stops
ISO
20000
30dB
5.3
Stops6.7 Stops
ISO
12800
26dB
5.3 Stops6.7 Stops
ISO
3200
14dB
5.3 Stops6.7 Stops
ISO
6400
20dB
5.3 Stops6.7 Stops
ISO
850
2.5dB
5.2 Stops6.8 Stops
ISO
800
2dB
4.9 Stops7.1 Stops
ISO
640
0dB
4.2 Stops7.8 Stops
ISO
400
-4dB
3.9 Stops8.1 Stops
ISO
320
-6dB
Canon Log
Base
Sensitivity
5.3 Stops6.7 Stops
ISO
1600
S/N
Ratio
41dB
45dB
53dB
50dB
54dB
54dB
54dB
54dB
54dB
54dB
8dB
8 9