Mailing List AE-List@media-motion.tv ? Message #45827
From: Red Truck <redtruckproductions@rogers.com>
Subject: Re: [AE] Color Control expression link to Colorama?
Date: Tue, 18 Sep 2012 23:41:26 -0400
To: After Effects Mail List <AE-List@media-motion.tv>
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Beauty!
 
Thanks Dan for your reply and suggestion on 'sample(Image)' command.
As new to using expressions I did some research on sample(Image) command.
 
Referencing the tutorials at these two links
and your tutorial;
 
I was able to successfully linked the Color Control on the null layer to follow the color sampling of the Colorama effect placed on a solid layer I called "Color_Changer" over the length of the time sequence.
 
using this expression on the Color Control effect:
 
target = thisComp.layer("Color_Changer")
target.sampleImage(transform.position, [width, height]/2, true, time)
 
Now I have the strokes in all shape layers in my sequence (linked to the single Color Control command), animated to change colors via the Colorama layer over time.
 
Cheers,
   
Robert Alsop
Red Truck Productions
Toronto
 
----- Original Message -----
Sent: Friday, September 14, 2012 10:09 PM
Subject: Re: [AE] Color Control expression link to Colorama?

The Color Control is expecting a 4-value array of numbers between 0 and 1 to specify the red,green,blue, and alpha values (example: [1,1,0,1] gives you bright yellow).
 
I think to get what you’re after, you’d have to apply the Colorama effect to a layer and use sampleImage() in your Color Control expression to pick up the color.
 
Dan
 
 
From: Red Truck
Sent: Friday, September 14, 2012 6:24 PM
Subject: [AE] Color Control expression link to Colorama?
 

Would appreciate some guidance here as I attempt to learn more about expressions.

 

Can I link the Color Control expression to the Colorama effect set up on a null layer in AE (CS5.5)?  

 

I have successfully setup a single Color Control expression effect on a null layer to change the stroke colors of 5 animated shape layers on 5 separate layers over video clips in a 1:30 sec sequence.

 

I can manually key frame the single Color Control on the null to change the colors of all the shape layers over time in the sequence.

 

However instead, I would like to link the Color Control to cycle through more rapid color shifts on the shape layers using the Colorama effect.

 

I have placed a Colorama effect under the Color Controller effect in the same null layer.

I have pickwip the Color Control to Colorama keyframed input Phase Shift (0x+0.0 - 0x+350 over time).

 

This creates the following expression:

temp = effect(“Colorama”)(“Phase Shift”); [temp, temp, temp, temp]

 

Haven’t come across ‘temp’ in the expression list:

http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-79f8a.html

 

Tried placing values in the expression as this example

temp = effect(“Colorama”)(“Phase Shift”) [0, 350, 0, 350] results in a green color in the Color Control and the shapes but does not change the color over time.

 

So what is the expression telling me besides messing up this step?

 

A link to a tutorial or alternate on animating the Color Control would be appreciated.

 

Cheers,

 

Robert Alsop

Twitter: @RedTruckPro

redtruckproductions@rogers.com

 

  

 
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