Canon C300 Custom profiles and gamma curves.
The C300 has 9 scene files that can be used, or turned off all together. These files are accessed via the "picture profile" button on the side of the camera. These are labelled C1 to C9. Additional custom profiles can be made or uploaded from the internet, put on an SD card and then loaded onto the camera. These files then appear as S1-S20 and can be loaded onto the camera, or just used directly from the card.
The last 2 of these in camera profiles are locked as standard:
C8: Cinema (This uses the Clog gamma curve for the greatest dynamic range.)
C9: Eos standard (same look as the standard picture profile on Canon DSLR - why anyone would choose to use this, I don't know)
The cinema profile using the Canon Clog gamma curve gives you the flattest image, with the greatest dynamic range. This profile does get the most out of the camera, but requires a fair bit of grading in post.
The best way to access the Cinema / Clog profile is not through the picture profile button on the side of the camera, but through the menu system. Go to the menu on the back of the camera, pick the camera icon > CP cinema locked >select ON and SET. (CP locked will appear on the left of the screen.)
This will then disable the CP button on the side of the camera, (Until you go back into the menu and turn CP lock off). CP cinema locked means you are using the standard Canon Log Gamma as it comes from the factory, this way you can guarantee you are using a profile that hasn't been adjusted by another user.
With cameras such as the Arri Alexa, you can assign a REC 709 gamma curve to an evf, to give you a more standard looking picture to work with. The C300 has a similar function when using Clog called view assist. I like using this in the view finder so you can get an idea of how the image might look when graded. I find this really helps with focusing. For more focusing help check out this.
Inside each of the 9 scene files there are many of the usual elements you would expect that you can edit: gamma curve, black, black gamma, low key saturation, knee, sharpness etc etc. Alan Roberts, a highly respected technician from the BBC, has written a paper on his recommended settings, I have noted down some of these comments in quotes below - followed by AR.
There are 8 Gamma curves to chose from:
Normal1 (default) NHK 4.0
Normal2 REC709 4.0 ("the 709 curve with lower slope near black"AR)
Normal4 BBC 0.4
Cine1 ("cinema like tones" "film for video…good for a film look for TV" AR)
Cine2 ("softer contrast")
This test from Kevin Richie on vimeo shows each of the gamma curves.
If there isn't time for a grade and client wants a baked in look, for a quick turn around edit, it probably makes sense to go with Normal3 (REC709). Here is what Alan Roberts has to say on this: "For broadcast purposes either Gamma 3 (ITU-709) or 4 (BBC 0.4) is perfectly acceptable. The BBC curve always produces more accurate colour rendition, but the 709 curve is normal for HDTV shooting"
Either you can make your own adjustment to create a custom picture profile, or download one from one of the many C300 users out there. I have used several of these which I prefer to use over the Normal 3 profile.
DP Brian Weed made some alterations to to the Cine, Log, and Eos Std picture settings, that mean there should be less grading needed in the edit. These can be downloaded from the links below, or to read more about each CP log you can read up on them here.
Another CP profile that I like is from Australian DP Roger Price. He has taken the recommendations of Alan Roberts and produced a CP profile that can be used straight out of the camera with no grading. Great for fast turn around shoots.
A video of the profile, and a link to download it can be found here.
Abel Cine, who are a great resource for information about camera equipment, have several different picture profiles for the C300 for shooting in different conditions.
For those who aren't familiar with the C300, here is a quick video I made to explain how to change the different custom picture profiles:
Also, if you don't own a Canon C300 and want to get familiar with these picture profiles before a job, Canon have a C300 simulator on line, so you can see how to load up various profiles for yourself.