Lectures and exercises

Chroma-Keying and Rotoscoping lecture

This lecture gives us a better idea about how, why and where chroma-keying and rotoscoping are used. It also talks about the ‘do’s and ‘don’t’s when doing chroma keying or rotoscoping. We are shown the proper way to use light when using green/blue screening.

Ex 1: When working with green objects a blue screen works better than a green screen. Working with chroma-keying and rotoscoping during the day gives a better final product because of natural light which creates a uniformity in shadows and bright parts on the different objects. When working with both techniques, we should make sure that the same kind of lighting is produced, even if we are working during the day. Rotoscoping is an useful technique but can prove to be more time consuming than chroma-keying. When working in a time constraint, chroma-keying might be better to use.

Tracking for compositing lecture

In this lecture we are introduced to 2D and 3D tracking. The differences and application of 2D and 3D tracking are discussed. Proper way of using tracking is discussed. It also talks about point tracking and how tracking helps to make rotoscoping simpler. Image stabilization is also discussed. The applications of tracking are shown.

Ex 2: When using chroma-keying or rotoscoping in a project , it is important to make sure that the objects moves together with the video. Therefore, it is important to use tracking in these situation. Tracking makes effects move along with object. This technique will be useful when I will add effects to my growing plant.

Special FX in Compositing

In this lecture aims at showing how visual effects work and how they are created. we are explained how visual effects decrease cost of production. It talks about how miniature , still images and matte painting can be used to create a composition.

Ex 3:

Glitter explosions : To create this effect, glitters can be filmed falling down or being thrown up using chroma-keying. A photo of a pile of the glitter taken, using the same technique  to act as the source of the explosion. Then on after effects with the scattering effect , position and rotation used to displace the glitters in the direction we want.

Audio wave ripple: For this technique, the radio wave effect available on after effect can be used. The size,displacement and velocity can be controlled to modify the wave and shape it the way we want. Also, rotation can be used to add slight movements to the wave.

Smoke effect: To recreate a smoke effect,we can either use a footage smoke filmed using chroma-keying or use particle effects available on after effects. Digitally reproducing the effect migth be safer and easier. To create a CG smoke effect we can add blur effects and turbulence effect to a particle playground effect.

Colour Grading

This is lecture talks about how to use colour grading. It gives details about the proper ways in applying colour grading. Compressed video will not have a proper light effect when colour graded. To have a nice light effect, when taking the original footage, the hue and saturation should be decreased. This way the graded footage will look nicer and can be manipulated more easily.

Typography in motion

This was an interesting lecture which showed us how typography is used in videos. It talks about how to use typography to make interesting intro. Also, it shows how images and typography can be used together to captivate viewers attention and deliver messages more effectively, like in the ‘Anatomy of a computer virus’. Compositing techniques can be used to make an interesting intro.

Common mistakes

This lecture gives us examples of mistakes that are commonly made by students. It summaries some of the mistakes that were discussed in the compositing fundamentals lectures. It will help us in refining our projects.




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