tint problem / RGB to ARGB

Programming Questions

flokuehnle

in Programming Questions • 2 years ago

cheers,

i have a problem: i am taking screenshots, take single lines out of them and save them as Images. things is, i need them to have transparency.

every trick i tried doesn't seem to do that.

i tried tint(255, 255, 255, 255) on the image; processing says this metthod doesn't exist. well, it's in the reference, dude! am i doing something wrong?

i tried to do an own method convertToARGB() which would do pixel math, no success.

what i get are always RGB images.

can someone help me out?

best f.

Replies(3)

PhiLho

Re: tint problem / RGB to ARGB

2 years ago

Show your code...

flokuehnle

Re: tint problem / RGB to ARGB

2 years ago

import java.awt.image.BufferedImage;
import java.awt.*;
PImage shot, disp;
String sender, date, path;
File dir;
void setup() {
size(1, 1);
frameRate(1);
sender=System.getProperty("user.name");
path="/Volumes/fktest/Public/screenshots/";
dir = new File("/Volumes/fktest/Public/screenshots/");
}
void draw() {
// this.frame.hide();
if ((frameCount%10)==0) { makeStripe(int(random(625))); };
}
void makeStripe(int yval){
date=nf(year(),4)+nf(month(), 2)+nf(day(), 2)+"_"+nf(hour(), 2)+nf(minute(), 2)+nf(second(), 2);
shot=createImage(screen.width, screen.height, ARGB);
shot=getScreen();
shot.resize(1000, 625);
PImage shotB = createImage(shot.width, 1, ARGB);
// shotB.tint(255, 255, 255, 255);
shotB = shot.get(0, yval, shot.width, 1);
shotB= convertToARGB(shotB, 200);
shotB.save(path+sender+"_"+date+"_"+nf(yval, 4)+".png");
}
// ********
PImage convertToARGB (PImage file, int alph) {
PImage out = createImage(file.width, file.height, ARGB);
file.loadPixels();
out.loadPixels();
for (int i = 0; i < file.pixels.length; i++){
color col = file.pixels[i];
out.pixels[i] = color((col >> 16) & 0xFF, (col >> 8) & 0xFF, col & 0xFF, alph);
}
out.updatePixels();
return out;
}
// *********
PImage getScreen() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] gs = ge.getScreenDevices();
DisplayMode mode = gs[0].getDisplayMode();
Rectangle bounds = new Rectangle(0, 0, mode.getWidth(), mode.getHeight());
BufferedImage desktop = new BufferedImage(mode.getWidth(), mode.getHeight(), BufferedImage.TYPE_INT_ARGB);
try {
desktop = new Robot(gs[0]).createScreenCapture(bounds);
}
catch(AWTException e) {
System.err.println("Screen capture failed.");
}
return (new PImage(desktop));
}

PhiLho

Re: tint problem / RGB to ARGB

2 years ago

I haven't tested, but I would try:
out.pixels[i] = color((col >> 16) & 0xFF, (col >> 8) & 0xFF, col & 0xFF, alph);
=>
out.pixels[i] = (col & 0x00FFFFFF) | (alph << 24);

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