Posts Tagged ‘rebel

14
Feb
11

Marvels Cine Picture Style 3.4 test movie

UPDATE: please follow the link “marvels cine for hdslr” at the top of this blog for more information and updated profile.

Jorgen Escher has published some new information about the Marvels 3.3 and 3.4 picture styles we will be using on an indie feature length production this year. He explains the differences between 3.3 and 3.4 and my (our) motivations to make changes to the default 3.3 style.

Jorg (for short) has also published a short test movie on his blog and on Youtube.

You can find Jorg here:  http://colorbyjorg.wordpress.com.  Jorg is an optical reserach engineer with the Fraunhofer institut, Darmstadt Germany and knows a lot about colorimetrics.

Follow that guy! @colorbyjorg

30
Jan
11

Phil Holland’s test images w. Marvels Cine 3.3 picture style

UPDATE: please follow the link “marvels cine for hdslr” at the top of this blog for more information and updated profile.

Click on the block above to jump to Phil’s article.

19
Jan
11

Finally, the new Marvels Cine Picture Style 3.x for Canon DSLR

UPDATE: please follow the link “marvels cine for hdslr” at the top of this blog for more information and updated profile.

Stay up to date by “Liking” http://www.facebook.com/marvelsfilm


UpdatePhil Holland has published an article with pictures about his experiments with this new picture style here.

Canon neutral
Marvels Cine 3.3 style
Canon Neutral style, contrast all down                                 Marvels Cine 3.3 style

As i wrote before in an earlier post, i was not particularly satisfied with the version 2.x picture styles i published as alternatives (NOT replacements) to the renowned and widely used Marvels Cine Picture Style for the Canon D and T/Rebel series vDSLR cameras.

With all due respect to Bart Keimen who provided most of the 2.x styles, i was not confident in using them for production work, and i sticked to the good old Marvels Cine style. I was contacted in december 2010 by colorist and formerly Fraunhofer institute scientist Jorgen Escher, who offered to help me with developing and testing a new Marvels Cine picture style successor.

After having shot a lot of footage with many many styles on both commercial and indy production work since 2009, using the 7D and the 5DMKII, and after receiving much feedback and many test reports and -footage from you all, i’ve come to a number of conclusions.

  • the Canon picture style editor sucks
  • picture styles that are too flat (pronounced S-Curves) do result in chromatic anomalies such as “plastic skin”, and gaps/irregularities in the histogram
  • the standard method of flattening (contrast all the way down, color 2 pegs down) is not flat enough
  • the Neutral picture style is colorimetric not ideal, to use as a basis for developing new flat styles
  • the Canon picture style  still sucks
  • the middle part of any S-curve (approx. 40-75% brightness ) should be kept linear to protect skin colours and exposure. The camera already has it’s own s-Curve that changes with the build-in style! Let’s not forget that! We are applying a curve to a curve! Using reference cards and precise measurement reveals this, and enables people like Jorg, who know what they’re doing, to draw a new curve on top.
  • white balancing and exposure is often judged wrongly when using a too flat style, and therefore results in underexposure and more colour problems – specially when using the camera’s LCD and omitting the camera’s Histogram display or when using an external monitor
  • the above can be solved when exposure and white balance is taken after selecting the unchanged Standard or Neutral style and then switch to the flat style for shooting – and i don’t like that!
  • did i already mention that the Canon picture style editor sucks?

Taken all this in account, Jorg has provided me with an all-new Marvels Cine Picture Style v.3.3.
It’s less flat than “super-flat”, is less flat than the first Marvels Cine, uses 10 curve nodes, does not touches any colour and is based on the Standard style as a base, instead of the Neutral style.
Exposure and white balance – special those of the skin – can be safely set using this new style if you judge these settings by eye.
The new style can made more and less flatter by adjusting the Contrast setting. Even if contrast is set in the middle position (4), it’s still flatter than the usual way of flattening the untouched Neutral style (w. contrast on zero).
The style is slightly more colourful than other flat styles, because it uses the Standard style as a basis.
The Standard style setting is used as a basis for this new style, because the s-curve required this in respect to the skin colours – for colorimetric and exposure reasons.
Jorgen tells me that he has created this style’s S-curve and .pf2 file WITHOUT the Canon Picture Style Editor, but does not want to tell much about this process YET.

And i am happy with it!! I hope you like it too. I invite everyone to try this new style and share with me their findings, comments and links to test footage. I hope to be able to provide you with examples after this weekend too.

I also want to encourage users to experiment with the base style setting of the new style (suggesting switching Standard, Neutral and Faithful).

The new Marvels Cine Picture Style v.3.3 can be downloaded here
(zip archive – please read the README file before use!).Creative Commons Licentie
The Marvels Cine Picture Style v.3.3 file by Marvels Film has been licensed following a Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 Unported licence. CC BY-NC-ND

Courtesy of Jorgen Escher -> http://colorbyjorg.wordpress.com – @colorbyjorg

Cheers!
Martin

31
Dec
10

About the Picture Profile and S-Curve of Canon video DSLR cameras

Hey Martin,

I have another question for you, since I’m just beginning to learn in the ins and outs of gamma curves:

I noticed in the original Marvel’s Cine Flat Profile 1.2, the gif of the gamma curve you posted seems to have a fairly pronounced toe, but not so much of a shoulder. This looks like to me that you’re pushing the apparent middle part of dynamic range a bit higher up. And I’ve noticed in my tests that the picture occasionally looks a tad dark if I expose for it correctly with a incident meter light meter (especially in low-contrast scenes.)

Should I be compensating +1/3 or +2/3 a stop for proper exposure with this profile? Or should I be exposing normally (with a light meter) and adjusting the picture to my preference in post? Or should I just not use a light meter and eyeball it instead?

Am I misunderstanding the gamma curve?

-Dave

Hello Dave.

What really is going on, is that we apply a curve on a curve. The sampling, filtering and further post-processing of the camera’s image-sensor is a very complex matter and we can’t imagine (and are not being told) what goes on “behind the scenes”. You can get an insight into the complexity by reading this wikipedia link on the Bayer Filter. After the camera eventually has rendered an electronic representation of a real world image, many extra circuits – both analog and digital – are put to work to turn it into anything useable and digital. With the extra handicap that the video image is further processed and compressed.

The picture profile settings (and a few extra image settings that can be accessed through the menus) are just the tip of the iceberg of the motherload of parameters and circuits that can be tweaked. Not only “simple” electronics are involved, but quite a lot of physics as well.
The eventual image (based on the selected preset profile, e.g. Neutral or Faithful) already has a quite complex curve applied to it electronically sometime during the processing described above. In fact, there already is something in place that resembles an S-curve! What we do by altering the curve, making that existing curve more pronounced. It also means, that when we pull it too much, relations between color channels are disturbed, resulting in “plastic skintones” and other weird and unexpected artifacts.

To get back to your first observation. The Canon D cameras all seem to underexpose when using an external light-meter, and this seems to have to do with the way the camera handles the ISO setting. Specially when you are using a flat profile, you can push it much more, maybe indeed to +2/3. The built in histogram display is your friend here! Try to Google on the subject and you will find many discussions regarding this issue. Some propose to lower the ISO setting on the meter.

You are right about the curve. It is S-shaped and you can see a typical picture of the Marvels cine profile below (many people have asked for this, so here it is!). Because it’s applied on top of an existing curve (we have no other option, we have no Raw), the actual resulting curve is hard to calculate/visualise without reliable measurement. Digital video cameras such as the Sony EX-1 can deliver a number of test signals to the post-processing electronics, so the effect of curves and painting can easily be analysed. The Canons don’t have this option. What one could do, is shooting calibrated multi-level grayscales and analyse the results. A graph can be drawn from those results, most probably resulting in a wobbly s-curve.

Marvels Cine 3.0 Panalog example curve

Click for enlargement

Also, changing the profile’s Contrast setting alters the curve – it is NOT linear. So, having said all this; using your eyes and the histogram is still your best option, and getting some experience with the profiles and the resulting footage.

I am currently using the new Magic Lantern firmware patch that gives me a spot-reading, so i can e.g. expose human skin on 75% and check highlights. This and watching the histogram gives me good results.

I wish you all a happy and prosperous 2011!

Martin Beek.




twitter.com/martinbeek

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