Reading pixels of image using JavaFx Image

Question

I want to read an image and print ARGB value of all pixels.

This is how I try to achieve that:

public static void main(String[] ar){ Image image = new Image("file:///C:/Users/PC2/Desktop/duke_44x80.png"); //ERROR HERE ImageView imageView = new ImageView(); imageView.setImage(image); PixelReader pixelReader = image.getPixelReader(); for(int x = 0; x < image.getWidth(); ++x){ for(int y = 0; y < image.getHeight(); ++y){ System.out.print(pixelReader.getArgb(x, y) + ", "); } System.out.println(); } }

But when I try to run it, I get an error at line Image image = new Image(...);

Exception in thread "main" java.lang.RuntimeException: Internal graphics not initialized yet at javafx.graphics/com.sun.glass.ui.Screen.getScreens(Screen.java:70) at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.getScreens(QuantumToolkit.java:699) at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.getMaxRenderScale(QuantumToolkit.java:726) at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.loadImage(QuantumToolkit.java:735) at javafx.graphics/javafx.scene.image.Image.loadImage(Image.java:1052) at javafx.graphics/javafx.scene.image.Image.initialize(Image.java:802) at javafx.graphics/javafx.scene.image.Image.<init>(Image.java:618) at test.core.MainCore.main(MainCore.java:11)

How to fix this error?

You need to start the JavaFX runtime. Is this going to be part of a larger JavaFX application? — Slaw
– Slaw, Commented May 14, 2019 at 14:01

Jeremy Then · Accepted Answer · 2019-05-14 14:40:24Z

You can try without JavaFX, like this:

Path path = Paths.get("C:/Users/PC2/Desktop/duke_44x80.png"); try(InputStream is = Files.newInputStream(path)) { BufferedImage bi = ImageIO.read(is); // Use ImageIO to create a BufferedImage int w = bi.getWidth(); int h = bi.getHeight(); for(int i = 0; i < h; i++) { for(int j = 0; j < w; j++) { Color myColor = new Color(bi.getRGB(j, i)); // bi.getRGB returns an integer like -14350844, representing the specific color. use Color class to get the individual colors with: myColor.getBlue()... System.out.print(myColor + ", "); } System.out.println(); } }catch(IOException e) { System.out.println(e); }

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