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milanesa

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  1. Some of this stuff definitely goes over my head. I do see a chroma (hue) shift (specially in the reds and warm colors) when I change from 709 to 601... that's why I assumed that it was a gamut related setting. Obviously, in the case of my GH1 clips, 709 looks more natural and pleasant.
  2. [quote name='yellow' timestamp='1343918022' post='14845'] There are a couple of ways rec709 & 601 are discussed: 1. Color primaries and color matrix. BT601 color primaries differ from BT709 but unless shooting DV (ie BT601) then HD video is BT709 color primaries. This has nothing to do with levels ranges but color gamut. 2. Color Matrix (Luma Coeffs). The color matrix only comes into play when converting a YCbCr (YCC for short) source file to RGB. Getting the wrong color matrix means a slight contrast change (not as drastic as 16 - 235 <> 0 - 255) and a slight color shift in reds to orange, blues to green and visa versa. Play back in a media player with or without hardware acceleration can even screw this up not only the NLE, leading the viewer to wrong assumptions about camera performance vs another camera. [/quote] SCRATCH has two separate setting for handling color gammut and luma. [img]http://www.eoshd.com/comments/uploads/inline/18737/501aa411bb8a0_cs.png[/img]
  3. [quote name='AdR' timestamp='1343884351' post='14816'] That's part of the problem, especially with h.264 footage, because many apps scale the luma when they see the h.264 flag in the meta data. The two methods I've used are: (1) Open the files in QT7 (which I have heard ignores scaling flags), then take a screengrab and open in photoshop. Use Info Window and Levels histogram to determine luma scale. (2) Set up AE CS6 with color space of Adobe RGB(1998), and import .mts file, then use Synthetic Aperture for scopes and histograms. (I believe using Adobe RGB (1998) causes AE to import the .mts file without any luma scaling.) If anyone has better methods, please post them. [/quote] Couple of methods I use: 1 - Rewrap the .mts clip to Quicktime using Clipwrap, Media Converter, FFMpeg, etc. Bring the .mov clip into Davinci Resolve, open the "Clip Atributes" and choose to interpret the color levels as "0 - 1023". 2 - Bring the .mts clips into SCRATCH, go to the Process Module in the FxCtrl tab set the YCrCb RGB mode to "Full". Both these methods work in OSX and Windows. Resolve [img]http://www.eoshd.com/comments/uploads/inline/18737/501a48b24a929_resolve.png[/img] SCRATCH [img]http://www.eoshd.com/comments/uploads/inline/18737/501a48dd7e034_scratch.png[/img] On a side note, these workflows work very well to create ofline editorial media and then reconform for color grading.
  4. So, what would be a good workflow? I recently loaded a few .mts clips from my GH1 on a SCRATCH system running on Mac. SCRATCH has the option to recover the full color range of the clips. They also played smoothly... but didn't spend to much time on it.
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