Thursday, 23 June 2011

Chromakey recipe

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Chromakey is a vital part of our video projects, but in this magic chromakey world exists some essentials things we must to know, lighting is the most important factor in determining whether your key will look wonderful or terrible.
Place your subject at least 9 feet (3 meters) in front of your blue or green screen.

Your camera must be as far away as possible. This will result in a narrow lens angle.

Important: green or blue screen is out of focus, irregularities will be less visible; a smaller portion of the green or blue screen is visible, which is far easier to light evenly; your foreground subject doesn’t cast shadows on your background.

When you do blue screen, you might want to use an orange/yellow toned backlight. Not too colored, half CTO or Straw will do. This will reduce possible blue fringing in hair or clothes, because the color of this backlight is complementary to the blue. The result after you have keyed will look like a normal white backlight.
If you use green screen you can use a pale pink or magenta correction filter (1/4 or 1/2 minus green).

A simple chromakey recipe:

  1. Set up a blue or green background of the type you are going to use in the shoot.
  2. Light it evenly
  3. Put your camera on manual iris
  4. Place a white card directly on your background (you can also write the f-stop that you use on this card for reference). Make a series of recordings, about 10 sec each, at different f-stops, starting at the underexposed side. So f11, f8, f5.6, f4, f2.8, f2.
  5. Capture the footage and put it in the timeline
  6. Apply a color correction filter to the clip
  7. In the effects palette click setup
  8. Turn on the scopes and choose vectorscope and Y (luminance)
  9. Locate that part of the clip where the white card just reaches 100% on the waveform monitor. It might be just below 100% at a certain f-stop and clipped to 100% in the next one. In that case it will be somewhere in between.

This basic steps will give you very nice kyes

Tuesday, 22 February 2011

Stream yourself

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Nowadays show and produce videos on internet continues to both excite and frustrate minds, but if you want to keep struggling on the road, these are some useful tools for stream your videos:

Stream from the web:
www.ustream.com
www.livestream.com

Stream by your own:
VLC/Videolan
Windows Media Encoder
Star Media Center
Unreal Media Server

Friday, 14 January 2011

Flash Particles

3 comments



















Particles are part of the many interesting effects we can create in Flash. it has a number of native features to allow for 3D transformation and projection. You’ll find that this is a combination of using the Vector, Vector3D, Matrix3D, PerspectiveProjection, etc.

Sure you would like a realistic candle flame, or explosion, or smoke. but certainly this will take you a lot of time, there are some components like Partigen (i think this is some kind of Particle Illution variation) that help us to save time.

In my opinion particles scratch are the most effective, they have been made for an specific purpose and of course adapted to your project, so put your hands on work, refresh your math lessons and create some new brand effect.

Here is a very simple tutorial, it could help you with basic skills
Simple Particle Effect
 
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