Nuke Tutorials and Tools

S_Despill Nuke Gizmo There are tons of despill gizmos and templates available in internet and nukepedia for nuke. Many compositors having their own set of gizmos and technic to do despill. Here is one of my all time fav despill gizmo i have created. Used in many instances over couple of years. S_Despill gives me lot of control in terms of edge management and retaining plate color. This gizmo gives much more control to user 1. User can visualise the the amount of spill removed from the plate. 2. Make your screen to middle gray after removing spill by adjust the multiply. 3. Red Contribution controlling the red amount of de-spill. Mask option give user to apply the red contribution on selected areas. (good for control the skin tone edges) Here is the video demo: Download:  http://www.nukepedia.com/gizmos/channel/s_despill

Keying inside Nuke using "expression" node: Green or Blue screen keying is a important task in compositing. Most off the artists (compositors) use any traditional keyer like Primatte, Keylight, UltraKeyer, IBK keyer etc... For complete the keying Task. Most-probably its the traditional way. For more information about keyer tools: http://www.fxguide.com/featured/art_of_keying/ What is happening while we play around (sliders) with above keyer tools. Some color math happening behind while we sampling the screen and adjusting the sliders for fine tuning the Alpha. Why don't we play with those color math function to getting alpha? Here is some example.. How to extracting the alpha channel from green or blue screen footages with some color math using nuke's "Expression" node. 1. Green screen: expression: r*1.5/g*.9 work file: https://skydrive.live.com/redir.aspx?cid=776f8351d9892b6a&resid=776F8351D9892B6A!251&parid=776F8351D9892B6A!133 ...