Change HUE expression

Community Beginner ,
Feb 09, 2022 Feb 09, 2022

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Hey guys!

 

I need to do an effect that recolors parts of a drawing.

I have each section of it that I want to recolor already separated.

What I need now, is to put an expression in the HUE value slider, to make it animate but skip say, 10 values at a time?
This way I don't get a color fade, instead I get different color steps.

My understanding of how this works tells me it'll be some sort of math.floor and dividing the results by the amount of numbers I want to skip, right?

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correct answers 1 Correct answer

Adobe Community Professional , Feb 09, 2022 Feb 09, 2022
Pretty much correct, though you will need to adjust the ranges since color ranges are float values in expressions: mSlider=thisComp.layer("XYZ").effect("Slider")("Slider"); mStep=10; mSkip=1/255/mStep; mHue=Math.floor(mSlider)*mSkip; mCol=hslToRgb([mHue,1,1]); Mylenium

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Community Beginner ,
Feb 09, 2022 Feb 09, 2022

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Found it!

posterizeTime(Math.round((time/10)+1)); random(360);

 

Credit to this guy: https://www.reddit.com/r/AfterEffects/comments/c9kw4m/random_hue_expression/

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Adobe Community Professional ,
Feb 09, 2022 Feb 09, 2022

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Pretty much correct, though you will need to adjust the ranges since color ranges are float values in expressions:

 

mSlider=thisComp.layer("XYZ").effect("Slider")("Slider");

mStep=10;

mSkip=1/255/mStep;

mHue=Math.floor(mSlider)*mSkip;

mCol=hslToRgb([mHue,1,1]);

 

Mylenium

 

 

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Community Beginner ,
Feb 09, 2022 Feb 09, 2022

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Actually, it's working in the Hue/Saturation effect!
Maybe it wasn't possible back when he posted that and now it is...

I need to tweak it for one thing though. I like that it's speeding up over time (coincidentally I also wanted this).

But, I need it to speed up more often and by more, as in, accelerate I guess.

So... if I do 50 there instead of 10, it'll just make it jump 50 numbers instead of 10, right? Does nothing to accelerate.

And if I add to the +1, that's a separate thing, right? Doesn't seem to do much either.
My animation is only 30s long so there's not a lot of time for it to ramp up.

It needs to be a... What do you call it. Exponential progression? Where with each acceleration step, it speeds up by a larger factor?

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