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Topic: fading images (Read 369 times) |
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ichbinjens
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fading images
« on: Nov 20th, 2003, 7:00am » |
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hi, i would like to fade an image from full alpha to zero alpha. please help or give suggestions as to how to create this effect.
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mKoser
 
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Re: fading images
« Reply #1 on: Nov 20th, 2003, 2:58pm » |
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somthing like..
Code:
// set the color and alpha of the image
tint(255, 255, 255, a);
// diaplaying the image
image(img, 0, 0);
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by setting using the tint() command, you can control what color the image will be displayed in (say, you can overlay it with red if you like) and what alpha (0-255) it should be displayed in.
look at:
http://proce55ing.net/reference/tint_.html
+ mikkel
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mikkel crone koser | www.beyondthree.com | http://processing.beyondthree.com
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ichbinjens
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Re: fading images
« Reply #2 on: Nov 20th, 2003, 9:32pm » |
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Hi, thanks for the reply. I am interested in sequentially fading my image from full alpha to no alpha, I know there needs to be a variable to do this but am not sure how to define it.
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vent
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Re: fading images
« Reply #3 on: Nov 20th, 2003, 9:54pm » |
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Maybe this will help:
Code:
int myAlpha;
BImage img;
void setup(){
size(200, 200);
img = loadImage("myImage.jpg");
myAlpha = 255;
}
void loop(){
// if you don't understand what this line is doing
// simply solve a couple iterations of it on paper
// then you'll get it.
myAlpha +=(0-myAlpha)*0.05;
tint(255,255,255, myAlpha);
image(img, 0, 0);
}
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http://www.shapevent.com/
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benelek
 
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Re: fading images
« Reply #4 on: Nov 21st, 2003, 2:16pm » |
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same thing, but easier to understand intuitively...
Code:
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