Hard color change by expressions

[Dan Ebberts]

Are you looking for color changes based on the audio level? If so, this is a simple three-color example:

aud = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
red = [1,0,0,1];
green = [0,1,0,1];
blue = [0,0,1,1];
level2 = 15;
level1 = 5;
if (aud > level2)
blue
else if (aud > level1)
green
else
red

If you need more colors, I would use arrays to clean up the code. If you need the colors to change in response to a “beat” and stay changed, that’s a completely different story, and requires some threshold-detection and/or beat-counting code.

Dan

[James Quetant]

No, actually I have the colors I want it to change to, I just want the audio to drive it.

I can’t locate the thread right now, but the expression I followed is below. That gives the gradual change I’m talking about

maxAudio = 70;
minColor = [255,205,47,255]/255;
maxColor = [213,116,45,255]/255;
aud = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
linear(aud,0,maxAudio,minColor,maxColor)

[James Quetant]

No, actually I have the colors I want it to change to, I just want the audio to drive it.

I can’t locate the thread right now, but the expression I followed was something like this;

maxAudio = 70;
minColor = [255,205,47,255]/255;
maxColor = [213,116,45,255]/255;
aud = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
linear(aud,0,maxAudio,minColor,maxColor)

[Dan Ebberts]

OK, so that’s the behavior you don’t want. Please describe the behavior you do want.

Dan

[Dan Ebberts]

Try this:

threshold = 10;
minColor = [255,205,47,255]/255;
maxColor = [213,116,45,255]/255;
aud = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
if (aud < threshold) minColor else maxColor

Dan

[James Quetant]

ok. That did the hard change but it only happened once. I want the audio I’m using to drive its change, so like change to the beat.
Now that I’m thinking about it, I would like them to change between 4 different colors. Driven by the audio

[Dan Ebberts]

Add additional colors to the colors array.


threshold = 10.0;

colors = [[255,205,47,255]/255,[213,116,45,255]/255];

audioLev = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

above = false;
frame = Math.round(time / thisComp.frameDuration);
n = 0;
while (frame >= 0){
t = frame * thisComp.frameDuration;
if (above){
if (audioLev.valueAtTime(t) < threshold){
above = false;
}

}else if (audioLev.valueAtTime(t) >= threshold){
above = true;
n++;
}
frame--
}

colors[n%colors.length]


Dan

[James Quetant]

Hey Dan, thanks for the help so far. I tried using that expression & I still got the same response, just 1 color change and that’s it. I added 4 different values to the array

[Dan Ebberts]

How many times does your audio go above 10?

[James Quetant]

well my maxAudio was at 70