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Index › Programming Questions & Help › Programs › help in colors and aplha
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help in colors and aplha (Read 462 times)
cavva
help in colors and aplha
Aug 18th, 2006, 4:54pm  
with this code
Code:

void setup() {
  size(200, 200);
  noStroke();
  background(255);
  framerate(60);
}

void draw() {
  fill(0, 1);
  rect(0, 0, width, height);
}


I've an effect that fade the background color from withe to black.

I don't understand why if i change the fill color with
Code:

fill(150, 1);


the background doesn't change
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st33d
Re: help in colors and aplha
Reply #1 - Aug 18th, 2006, 6:58pm  
It'll work with fill(150, 2); and likewise it works with anything up to (127, 1).

My guess is that something to do with the way it calculates the new color from the alpha overlay results in a value that gets rounded off somehow.

I'm sure someone senior could explain this better. For now I'd hack around it for the time being if I were you.
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cavva
Re: help in colors and aplha
Reply #2 - Aug 18th, 2006, 7:27pm  
st33d wrote on Aug 18th, 2006, 6:58pm:
It'll work with fill(150, 2); and likewise it works with anything up to (127, 1).

My guess is that something to do with the way it calculates the new color from the alpha overlay results in a value that gets rounded off somehow.

I'm sure someone senior could explain this better. For now I'd hack around it for the time being if I were you.


true,
and what is the max alpha value 100

i've tried this code and i get 2 different color, again why
Code:

void setup() { 
  size(200, 200); 
  noStroke(); 
  background(255); 
  framerate(60); 
} 
 
void draw() { 
  fill(150, 5); 
  rect(0, 0, width, height/2); 
  
  fill(150, 2); 
  rect( 0,  height/2, width, height/2);
}

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