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This short tutorial is based on Eyeon Fusion's particle system, but the same technique can be implemented in any particle-capable compositing or 3D-software:
...

This article explains the math, benefits and issues of multi-pass compositing using V-Ray render elements as the basis.
All the techniques are applicable to render passes, generated by other...

See also:
http://vfxpedia.com/index.php?title=Community_Portal/Studios_List

A fresh example of using Fusion's volumetrics in producion:

http://vimeo.com/33897232

Massive updates in a collection of tools, tips and articles about compositing:

http://www.vfxpedia.com/index.php?title=User:Gringo
...

Hello!

I was recently trying the new particles in Nuke 6.3v5 and I found the way ParticleCurve modifies the input properties of particles a little strange...

It modulates the initial particles'...

This Fusion plugin: http://www.revisionfx.com/products/twixtor/
Would give you a better result without frame blending or doubling.

Hi!

It's hard to work out what's happening looking at this screenshot.

Try this macro: http://vfxpedia.com/index.php?title=Settings_and_Macros/DepthDefocus_Description

Hi!

You can use the Probe modifier for that.

RMB on your ColorCorrector's Blend, Modify With>Probe.
Then drag 'n' drop the background to the Image to Probe field.
Select Probe Rectangle, set...

See also:
http://vfxpedia.com/index.php?title=Settings_and_Macros/AdvancedCameraShake_Description
;)

If you want to use Grain, you can adjust the Spread curves and pre/post scale your image, although there are dedicated noise tools like...

To restore the color data around edges, you need to perform a divide operation in the ChannelBoolean.

Of course, in that case you need a 32bit float image. Besides, black color in the areas where...

In this case you need to use Fusion's 3D suite and render your 3D-text using the imported tracked camera.

Do you mean the Multiply mode in the Merge?
It's not a pure multiplication. It uses the Alpha as a mask and adds alphas to indicate modified areas.

If you want just multiply one image with...

Answering literally, Alpha>1 is an incorrect case. Apart from brightening the color values (RGB*2 will be brighter, obviously), you'll have a lot of issues with that, including incorrect merging.

Hi!

Yes, you can either assign the Matte-Shadow material to your objects or split your particles into layers by depth to insert the objects between the layers in compositing.

Jeff, I've looked into your PREMULT.zip and I can assure you it's not a premultiplied picture :)

Actually this mess usually comes from AE terms Alpha: Straight/Multiplied/Multiplied, matted with...

Hi!

You can either copy the keyframes between the tracks in the Timeline by Ctrl+drag or connect the imported paths to a Tracker tool's offsets and connect the polygon to the Tracker's number...

Display both tools on the Control Panel. You can use the pin button to the top right.

This can help:

http://vfxpedia.com/index.php?title=FAQ/Tracker_to_Masks

http://vfxpedia.com/index.php?title=FAQ/3D_to_Masks

You can set simple expressions for the Xrotation and the Zmove by entering "=" to the number field and pressing "enter". Then just press and drag the (+) button to your custom attribute.

Hi!

If you mean conversion for your curved motion blur task, you actually need a CustomTool at first.

I'm not sure if this is the best solution, but to convert a gradient which could be used...

Hi!
Try using the UserControls tool script (RMB on a node>Script>UserControls)

Burn-in and Alpha Gain are just multipliers for FG Alpha, they give you a possibility to perform a pure Add operation with no alpha involved.

Otherwise you're right. To use additive merging, you...

Yes, this can be done right in Fusion.
Sorry, I can't do testing right now, but the key is creating a black to white gradient, warping it's direction according to motion, then turning it to motion...