Re: Washed out JPEG2000 images

[Terrence]

You can find the answer in the OpenDCP FAQs.

http://code.google.com/p/opendcp/wiki/FAQ

You are trying to view an XYZ color spaced image on an RGB monitor…
and that isn't going to look right. Your images are fine.


On Thu, Jan 16, 2014 at 12:10 AM, Kenneth Larson
<larson....@gmail.com> wrote:
> Hello,
>
>
> This short film I'm making has really opened my eyes to the world of codecs
> and color profiles, so I'm all a little new to this. Like some people, I’m
> having an issue with the color profile on the JPEG2000 images. Everything
> exports with this really washed out look and greenish hue. I’ve tried using
> OpenDCP to convert a TIF Sequence to a JPEG2000 sequence, and I’ve also used
> After Effects to exports a JPEG2000 sequence using the j2k plug-in. It has
> the same results each time. Here's my workflow. Let me know if you have
> additional questions:
>
>
> Workflow:
>
> Edit RAW .R3D 5K files in Premiere Pro CS6
> Timeline is imported to DaVinci Resolve and color corrected
> Colorists exports 5K .mov files using the Cineform 4:4:4 codec [color
> profile says: HD (1-1-1-)]
> Reintegrate 5K files into the Premiere timeline
> Send timeline to After Effects
> Color Settings:
>
> Depth: 16 bits per channel
> Working Space: DCDM X’Y’Z’ (Gamma 2.6) 5900K
>
> This is what the j2k software user manual says to use.
>
> Export > Add to Render Queue
>
> Output Module Settings
> Format: JPEG2000 Sequence
> Depth: Trillions of Colors
> J2k settings
>
> Digital Cinema
> J2C format
> Custom bit depth: 16
> YCC box is checked
> DCI Profile: Cinema 2K
> 238 Mb/Sec
> 24 FPS
> Stereo
>
>
> I’ve attached two still frames. The (clearly) awful looking one is the XYZ
> .j2c file and the other is an RBG JPEG file (the TIF was too large, so I
> exported it as a JPEG in Photoshop). Is there any resolution other than
> having my colorist export the color corrected files again, but with an XYZ
> profile?
>
> Thanks!
>
>
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[Kenneth Larson]

Wow. Right there in plain sight, ha! Luckily I've got a friend who's a projectionist and we can test this thing out. Thanks!

[Eric Sebalsky]

fraunhofer's "easyDCP" player (the free trial version plays 15secs) gives pretty good results for a quick check up. it has emulated XYZ to RGB transform and tries to mime cinema gamma as well. if it looks scarily wrong there it probably is. it will not replace a check-up in the cinema of course but if you drag in a jp2000 still image it will transform to RGB adn gamma 2.2 so that you can get a feeling of it. there is also doremi's "cineplayer" which plays back only 15 secs as well but from anywhere you want (whereas easyDCP player only shows you the first 15secs) - the color transform is not nearly as accurate as easyDCP's one though.

[Stephen van Vuuren]

I use both EasyDCP Player+ for the 15 second check and Stereoscopic player with does XYZ transform (not quite as accurate as EasyDCP but if very affordable ($20) and plays the whole files. But these are just checks before I reserve time in a theater.

 

stephen van vuuren

336.202.4777

 

http://www.insaturnsrings.com/

http://www.sv2dcp.com/

http://www.sv2studios.com/

 

A film is – or should be – more like music than like fiction. It should be a progression of moods and feelings. The theme, what’s behind the emotion, the meaning, all that comes later.

–Stanley Kubrick

--

[Eric Sebalsky]

yeah, the stereoscopic guys are good friends of mine, but unfortunately their software is still only available on windows and no plans for a mac port in the near future. but apart from that: +1

[Shanu Novic]

I read that rgb -> xyz conversion that adobe does is not 100% DCI compliant: http://dcinemaforum.com/forum/index.php?topic=305.15

Is that still the case or did adobe fix their LUT for this particular color conversion?