How to detect if a RGB is fully transparent?
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omega
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Published on 2014-08-23T04:15:23Z
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2014/08/23
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In java, I want to make a fully transparent RGBA, and I do that by using
public static int getTransparentRGB() {
int r = 0;
int g = 0;
int b = 0;
int a = 0;
int new_pixel = (a << 24) | (r << 16) | (g << 8) | b;
return new_pixel;
}
Color color = new Color(getTransparentRGB());
System.out.println(color.getAlpha()); // -> 255 ?!
I purposely keep all rgba values 0. However after I create the Color
object with the rgba value as the constructor, if I call .getAlpha()
, I get 255
even though I made the rgb value with a 0
alpha. If it returns 255
, how could I tell the difference between a Color object that wasn't transparent, because that would also have a 255
alpha.
I expect the color object to return a 0
alpha based on the function above.
Does anyone know whats going on?
Thanks
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