Archive for the ‘Color’ Category

DaVinci Resolve 11: Now also an NLE…

Tuesday, April 8th, 2014

  • <<<
    • The update to DaVinci Resolve 11 will be available in June for download from the Blackmagic Design web site free of charge for all current DaVinci Resolve customers.
    • now it’s a fantastic full featured online editor
    • DaVinci Resolve 11 also features a unique and powerful automatic color chart color balancing tool that works on all types of footage including video, RAW and even film. The new color match tool automatically gives a primary base grade by analyzing shots containing standard color chip charts even if they were shot in different lighting conditions with different exposure and color temperatures.
  • >>>

Methyl Orange Stain Removal

Saturday, June 30th, 2012

A friend’s son dropped some methyl orange solution on a light-grey carpet.  Naive attempts by the parent to remove it using “Vanish” (a domestic carpet cleaning product) merely resulted in it changing colour from orange to yellow.  I am no chemist, but here I search for a stain-removal method.

Web-search seems to indicate that:

  • Methyl Orange is a traditional form of dye.
  • Also it is a ph indicator, a water solution of it is orange in its own weakly acidic state, becoming yellower with increasing alkali.  I guess “Vanish” is alkaline then…
  • It is also toxic and could potentially be carcinogenic, e.g. if the powder is inhaled.
  • It breaks down in daylight?
    • In that case maybe all my friend needs to do is hang it ouside in the sunshine?
    • Or does this only happen in the context of specially-treated fibres?
  • ???


EDL-Associated Apps on Mac OS

Sunday, January 15th, 2012

These are the applications  listed when, in my Windows VM on Mac, I did [RightClick>OpenWith] on a [.EDL] file:

  • Avid:
    • ALE
    • EDLManager
  • Apple:
    • Color

Colour Spaces: YUV<->RGB, 601/709 etc.

Friday, January 13th, 2012
  • 601/709
      • Usually (video content) is created in RGB, but stored as YCbCr.
      • Upon display it will be converted back again to RGB.
      • This means that two color conversions will take place. The problem is that there are different ways of doing this conversion. If the two color conversions are not the same, the displayed content won’t be the same as the original content.
      • So when converting YCbCr to RGB upon display, the correct color conversion standard (Rec.601 or Rec.709) must be used, namely the one which was used when storing the content.
      • (Rec.709 and Rec.601 are short for ITU-R BT.709 and ITU-R BT.601.)
      • ~ When a Rec.601-encoded YUV is decoded using Rec.709, the picture is more saturated and also red is shifted a bit towards yellow.
      • ~ When a Rec.709-encoded YUV is decoded using Rec.601, the result is a less saturated clip, with red shifting towards magenta and blue shifting to cyan.
  • YUV Color Space
      • Has images showing how increasing Y also changes the colour (which is how I end up with “pizza-faced” people if color curves over-used).
      • …and how some colours become unrepresentable
        • No yellows at low Y
        • No reds or blues at high Y
  • Lab Color Space

Apple: Final Cut: Color: Tutorial

Saturday, July 16th, 2011