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Topic: setting alpha of an image (Read 430 times) |
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ufux
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setting alpha of an image
« on: Feb 6th, 2005, 12:05pm » |
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I'm changing the alpha values of an image but it gets transparent for one frame then not for the next.
Here is the code:
int wSize = 640;
int hSize = 480;
int bgColor = 0;
int tolerance =38;
int replacementColor = 0;
int[] imageAlpha;
BImage icon,bg;
void setup() {
framerate(1);
size(wSize,hSize);
bg = loadImage("bg.gif");
replacementColor = color(125,0,0,0);
imageAlpha = new int[640*480];
background(bg);
}
void loop() {
//image(bg,0,0);
bgColor = get(100,100);
icon = loadImage("5.jpg");
image(bg,0,0);
for(int i=0;i<icon.width*icon.height;i++) {
if(inColor(icon.pixels[i])) {
imageAlpha[i] = 0;
} else {
imageAlpha[i] = 255;
}
}
icon.alpha(imageAlpha);
image(icon,0,0);
System.out.println(icon.pixels[100*100]);
}
boolean inColor(int tcolor) {
if(red(tcolor) < red(bgColor)+tolerance && red(tcolor) > red(bgColor)-tolerance) {
if(green(tcolor) < green(bgColor)+tolerance && green(tcolor) > green(bgColor)-tolerance) {
if(blue(tcolor) < blue(bgColor)+tolerance && blue(tcolor) > blue(bgColor)-tolerance) {
return true;
}
}
}
return false;
}
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fjen
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Re: setting alpha of an image
« Reply #1 on: Feb 6th, 2005, 3:09pm » |
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it is a bad idea to use loadImage inside the loop. that's because disk access is always slow ...
maybe that already removes the behavior.
/F
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