Archive for the ‘enhance’ Category

MBR Color Corrector: Update to Version 2

Wednesday, December 26th, 2012

MBR Color Corrector, by Matt Roberts, is a plugin Effect for Adobe Premiere and After Effects, to automatically color correct movie clips / footage featuring a Gretag MacBeth / X-Rite ColorChecker chart or card in-shot, e.g. at the beginning or end of a scene or take.

This provides an alternative to manual (hence subjective and probably iterative) color adjustments in conventional Effects in the editing application (Premiere or After Effects).

When applied appropriately, the workflow-result can be improved productivity and quality, with reduced (as opposed to avoided) dependency/demand on Colorist expertise and accurate color monitors etc.  It not only handles typical color temperature issues but also, to a useful degree, non-linear luminance and color “twisting” inherent in certain cameras and lighting conditions.

In addition to color correction, MBR Color Corrector can also be used for color matching, e.g. to match a mood, as previously established in an example prepared by a Colorist, provided that example likewise contains some frames featuring a Gretag Macbeth / X-Rite color chart or card.

The new version (v.2) features:

  • Mac support.
  • An improved, more intuitive, user interface.
  • Keyframes on everything that effects the output.

The free (gratuit) functionality is almost complete (no watermarks etc.) and in my experience has certainly been useful on real projects.  The paid version has greater efficiency and functionality, and encourages the developer to keep developing.  See the product web-page for more details.

See images in corresponding entry in my main blog.

Effects-Order: Denoise before Deshake

Thursday, November 1st, 2012

This is my impression, from the expressed views of others:

  • If you have e.g. 60i or 50i then do any stabilization first, so it gets maximum temporal information, prior to any deinterlacing e.g. to corresponding 30p or 25p.  Presumably if double-deinterlacing e.g. to 60p or 50p then this is immaterial.
  • If you’re using noise reduction, always do that prior to stabilisation as it helps the algorithm to concentrate on wanted detail and not on random noise. But then if it’s Neat Video denoising then that works best with stable progressive material.

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Cineform and Alpha Channels

Friday, August 31st, 2012

The full (paid) version of GoPro-Cineform Neo (as I have) does support alpha channels.

(A colleague initially thought otherwise – but that impression turned out to be based on info from old forum threads)

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Chroma Upsampling (Chroma Interpolation)

Friday, August 31st, 2012

Shooting green-screen onto a 4:2:0 chroma-subsampled format, intending of course to use it for chroma-keying.  Obvious disadvantage is green-ness of green-screen only gets sampled at quarter-resolution.  Not a show-stopper, given my target deliverable is standard definition, but anyhow, towards perfectionism, is there any way to up-sample to 4:4:4 i.e. full definition colour?

It does occur to me that something more sophisticated than chroma blur ought to be possible, broadly along the lines of edge-following methods employed in resizing. What’s out there?

  • Simplest method, that most people seem to use, is chroma-blur.  That’s only the chroma, not the luma.
  • Searching around, Graham Nattress has analysed the problem and seems to have produced a more mathematical approach.  But it’s only available (at time of writing) for Final Cut (which of course is Mac-only at present).

Some tools that “promise” upsampling, but I wonder by what methods:

  • GoPro-CineForm intermediate.  The codec settings include an option to up-sample to 4:4:4
  • Adobe Premiere, but only if a Color Corrector effect employed.
    • But the crucial thing here, regarding the usefulness of this, is whether it uses any better method than chroma blur.

Some questions:

  •  Does Adobe have anything built-in to do something Nattress-like nowadays?
  • DaVinci Resolve?
  • Boris?

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UNVEIL: De-Reverberation And Signal Focusing Processor

Monday, April 30th, 2012
  • http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=808171
    •  <<<
      UNVEIL is a real-time, de-mixing based plug-in that allows attenuating or boosting reverb components within a mixed signal of any channel count, including mono sources, as well as modifying contained reverb characteristics. Additionally, UNVEIL allows bringing the key features of a recording into focus, or moving them to the background, by attenuating or boosting perceptionally less important signal components.

      UNVEIL as well as a free trial will be available from the Zynaptiq website Monday, March 26th.

      UNVEIL comes as Mac AU (AudioUnits) Plug-In, with VST and AAX support for both Mac and Windows platforms planned for later in 2012.
      >>>

iZotope Ozone: Purchase (& Reasoning)

Sunday, January 1st, 2012

Seems a little pricey, but worthwhile in my case because it addresses two requirements that have been nagging me (before I discovered that product):

  • Has intelligent compressor, maximizing loudness and minimising dependence on manual tweaking (eqials time in post).
  • Has good-quality reverb.

It’s a plugin (DirectX /DLL), no standalone application.  Hosts / plugin formats:

  • The manual refers (Page 119) to <<Pro Tools, VST, AU and MAS versions of Ozone … (and) DirectX version>>
  • The website
    • Plug-in formats:
      • Pro Tools 7.4+ (RTAS/AudioSuite), VST, MAS, Audio Unit, DirectX
    • Plug-in host compatibility:
      • Pro Tools, Cubase, Nuendo, WaveLab, GarageBand, Logic, Audition, SONAR, ACID, REAPER, Sound Forge, Peak, Ableton Live, and many more
      • Does not mention:
        • Sony Vegas (even though I found it works in this)
        • Adobe CS5.5 Production Suite e.g. Premiere.  Can it work with this and its siblings?
  • c

Unshake: A Tool to Un-Motion-Blur (deconvolute) a Still Image

Tuesday, December 6th, 2011

Training: Den Lennie’s “Music Video” Experience

Thursday, October 27th, 2011

I attended, working on one of the camera units.  Had a great time, learnt lots, at all sorts of levels.  Even how to make good use of the Movie Slate application on my iPhone!  Link: http://www.fstopacademy.com/

iPhone 4: Audio: Voice Memo: Audio Enhancement

Monday, September 26th, 2011

Having extracted my iPhone’s VoiceMail recordings, I reviewed them and they sounded boomy – from room resonance.  The best audio enhancement app I know is iZotope RX2, which I have for Windows 7. Windows 7 was run within a virtual machine under Parallels within Mac OS.  I allowed this Windows to read, but not write, Mac OS files.

  • The first enhancement was a parametric EQ
    • Settings: frequency 274Hz, gain -21dB and Q=1.
    • The result sounded better and looked more even in the spectrum analyzer, which prior to that “glowed” around 300Hz.
  • The next enhancement was Denoiser
    • Settings: Advanced, Algorithm D (best, slowest), defaults (including -12dB reduction)
    • Not quick – not much faster than real-time as compared to the recording.
  • Finally, following this “tonal & broadband attenuation” processing, some amplitude processing in terms of dynamic range compression and overall gain.